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Comments 8401 to 8450:

8401. JW1234 at 21:10 PM on 14 January 2020
      I had an intense conversation at work today.
      

      Gidday there Barry,
      by complete coincidence, as i was scrolling through some other posts just now elsewhere, i discovered this... and so thought of you:

      Link to article in The Conversation

      Moderator Response:

      [BW] embedded and activated link to avoid it breaking the page formatting

8402. Eclectic at 21:07 PM on 14 January 2020
      I had an intense conversation at work today.
      

      Barryn56 @ #8 , you are hinting that there is some major causation (of our modern global warming) which must be "not CO2" .

      It would be a kind deed if you explained this in detail at once, for it would relieve some of Doug_C 's unhappiness.

      Sure, the rapid warming and ocean acidification etcetera would still be causing considerable biosphere damage . . . but at least Doug_C & other citizens would feel much less of collective guilt.

      Barryn56 , I hope you are not toying with us readers, by going on to suggest Electric Universe effects, or Cosmic Ray effects, or Planet Nibiru effects, or suchlike fantasies.  A genuine scientific explanation is required from you.  And please don't come out with PRATT*  [*Points Refuted a Thousand Times] or other insane nonsenses which surface all too often on the WUWT website.

8403. Doug_C at 19:24 PM on 14 January 2020
      I had an intense conversation at work today.
      

      I live in southern BC, Canada and we've had some wicked wildfire seasons in recent years, not as close to devastating as in Australia right now though. I've been following this since the late 1980s and watching the warnings being made then now start to become a reality is surreal, how could we ignore something that so many of the most informed people have been stating over and over in clear terms is an existential threat.

      Getting caught in the middle of the extreme impacts of this is frightening, last year I almost lost my home to massive wildfires all around the area I live in and the year before that my brother and his family were the last ones out of the small city where we grew up and that was evacuated and patrolled by our military for a month Because of the massive wildfires all around it. One reached over 500,000 hectares, that seems pretty Biblical to me.

      How can anyone still seriously claim that this isn't happening and that it isn't of the utmost importance that we take systemic measures across the globe to deal with this. They should have started decades ago, now we're looking at emergency mitigation of an exinction event that already seems to be well underway.

      It sounds hopeful that you were able to make at least some progress with an individual, but how meaningful is that really. In the province right next door which had record wildfire activity last year and in 2016 had most of a city burn down from an early spring heat wave, the government there is spending millions of dollars to openly attack the science of climate change because it negatively impacts the main economic driver there, the oil and gas sector.

      Jason Kenney touts $30M 'war room' but provides few details

      How do you address a dominant groupthink that still places short term individual interests over everything. Even the survival of our species on the scale of decades from now when we look at how much trouble the biosphere is already.

      If we've already killed half the life on Earth;

      Understanding extinction — humanity has destroyed half the life on Earth

       

      A what is left is at great risk;

      UN Report: Nature’s Dangerous Decline ‘Unprecedented’; Species Extinction Rates ‘Accelerating’

       

      Then this is no longer about short term individual interests at all.

      I just shake my head when people go on about price of power from different sources and economic projections decades or more in the future based on factors that are already well on the way to exterpating most life on Earth in a matter of decades.

      I'm not sure what the answer is, but refusing to even ask the question which is still the default on a policy level almost anywhere is... I don't have a word for it. How do we even describe killing off the overall biological system that makes life possible for such a rich biosphere in the first place.

      I'm no longer religious, but I'm pretty sure this is not what was meant about god giving man dominion over the natural world. It was meant as stewards, not destroyers. Yet that is exactly where we find ourselves.

8404. barryn56 at 18:53 PM on 14 January 2020
      I had an intense conversation at work today.
      

      Hi, as I live in Australia (Queensland) I have to comment that - again - here we have a tragic, though common, occurence couched as climate change driven. There have been much larger Australian fires in the past - 1974 comes to mind - so about 50 years ago - maybe climate change was worse then? These latest fires were in much more populated areas, hence the larger media coverage, despite covering one tenth the area of previous years'. Having said that, if you are really interested in understanding the science and why it has been hijacked, it is not difficult to conclude that CO2 is not the main reason behind planetary warming. My background is Physics, with a masters in engineering (both from the UK) and I have been directly invovled with geosequestration projects where we meet scientists vying for a share of $100 million in grants. I can tell you, that is a mighty strong cognitive biasing agent. My experience is that, if you're already believing the dogma, stating facts has little infuence because the issue becomes emotional, not rational. People have to research the facts themselves and question their belief - so if you google the bushfire histories, I can assume you are on the path to knowledge...

8405. Eclectic at 18:32 PM on 14 January 2020
      It's Urban Heat Island effect
      

      Absolutely right, Darinscoop, if not more so.  The alternating currents of the urbanised regions do produce a concentrated electromagnetic induction effect, warming the temperature sensors in the local weather stations.  The previous explanation of UHI from "exhaust-heat and sun-warmed pavement" is a shabby falsehood put forward by a conspiracy of contrarians, who are receiving grants & other funding from Big Oil.

      The world is actually cooling and the sea level is falling.  Even the contrarians are hoaxing us.

8406. Darinscoop at 16:01 PM on 14 January 2020
      It's Urban Heat Island effect
      

      Yes.  I admit...I am a "Heat Islander" until all sources of science has been observered this effect has no bearing in cultural concern.   This said, I have often wondered about how a geologist would respond to this subject as I have been taught that surface models have a tremendous impact on global climate.   Then a friend of mine shared this link to me that shows that there is a noteabel absense from this field of science among the GWA board (LINK).   If this wasn't enough to anger me, University of Maryland University College made a determination that the geology course was no longer transferrable as a "life science" towards my degree (this was during the time when the focus started shifting on the perils of greenhouse gasses in the media).  Anyhow, if anyone is interested, I will gladly explane the global relief map codes that apparently used to be used by climatologists.  I hope I can still find a copy of one online to illustrate.

      Moderator Response:

      [DB]  That is not a credible source for science information, as this Note details at length.

8407. richieb1234 at 11:43 AM on 14 January 2020
      2019 in climate science: A continued warming trend and 'bleak' research
      

      nigelj & michael sweet:

      Thanks for the feedback and helpful suggestions.  My comment was not meant to express frustration.  I really do think that energy/heat is a better measure of the warming than temperature.  I will have to give iit more thought.  meanwhile, I will use more pictures and fewer numbers.

8408. Claire Cohen-Norris at 11:01 AM on 14 January 2020
      I had an intense conversation at work today.
      

      ilfark2... Perhaps you can consider me a data point of evidence that your impression of CCLers is not quite accurate?  Most of the people I work with (as a volunteer), live, eat, breathe climate work, driven by a sense of urgency that our families and relatives marvel at.  I certainly do not want this post to be about CCL, or the relative merits of our work or our bill.  We can save that for another post, another day.  
      
      But please know that this CCLer, along with many others, are quite alarmed and engaged to act.

8409. Claire Cohen-Norris at 10:48 AM on 14 January 2020
      I had an intense conversation at work today.
      

      Thank you all for your thoughtful comments and questions.  It is not easy to put a simple intense moment out for everyone's scrutiny.  Thank you for taking it with the seriousness that these conversations really deserve, though often do not get.
      
      This conversation is now several days old.  This man has sought me out each day since to raise another concern...a challenge to accepting climate change.  He starts with the concern, we talk about it a bit.  Then we talk about some niceties, about our families, our pets, events at work.  Then he raises some other idea that confirms climate change, with a spark of how crazy the weather is, or how scary things are.  Usually at this point, he talks about what he needs to do to protect his financial and familial interests.  Then I return us to our obligations to others.  Today, after talking about disappearing housing insurance in California, and plummeting house values in Miami, he began to talk about selling his houses and renting.  I said that might be sensible.  But we have an obligation to others.  His go-to reaction is that everyone should pull themselves up by their bootstraps.  So I said, if you want to talk about needing walls, imagine what this nation will look like if everyone in Miami that is poor becomes homeless.  We need a plan...a PLAN...to avoid that...even if it isn't out of kindness, but simply to deal with this in a way that maintains stability.  If only we had had a plan 20 years ago to deal with the current insurance crisis in California.
      
      So what is interesting here is that he has decided he trusts me.  And he is continuing to come to me to try to grapple with the conflicting feelings and worries.
      
      It now feels like a heavy weight in some ways because he is clearly counting on me to help him make sense of this.  And, of course, making sense of this is no easy task.  I will be grateful if I ever do, myself.

8410. nigelj at 10:05 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Michael Sweet @70, yes Taminos description of the vapor pressue thing is convincing. I've pretty much had my say too.  The media have screwed things up by saying unprecedented without being clear what they mean, but saying things were worse in the 1970s doesn't help much either because its too early in this fire season to compare.

8411. Hank11198 at 10:03 AM on 14 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      OPOF @ 43

      
      OPOF I obviously didn’t explain how the wind charts are made very well. I’ll try again. In the 2005 version of the code the wind charts were made from 25 year, 50 year, and 100 year storms for the different risk categories. A 50 year storm has a 2% (1/50) probability of occurring at a location every year. The probability of a 50 year storm occurring over the 50 year design life of a building is 67%. This is of course way too large a risk. So the code applied a 1.6 load factor to the calculated wind pressure which in effect changes the 50 year storm to a 700 year storm. The risk of a 700 year storm occurring at a location over the 50 year life of the building is about 3% (That’s about right but I haven’t looked at the numbers in a while). That is what the code considers acceptable for a category II risk.

      Now the 2010 version of the code (and later versions) change the wind maps to show the wind speed of a 700 year storm and eliminated the load factor (or changed it to 1.0). Of course the wind speeds increased but that way everyone can see exactly what wind speed we are designing too, not the wind speed that is increased by a load factor for design.

      The speed that is calculated for a 700 year storm for a specific location is based on past data. Every time a revision is issued the wind speed will probably be slightly different because there are 5 more years of data to include in the calculations. The study I linked estimated maximum global wind speeds between 1% and 10%. But that is global, not local. The maximum local wind speed for a specific location might be larger or smaller or the same as in the past. It’s the difference between climate and weather. In addition the maximum wind speed at a specific location will not be the wind speed of a 700 year storm, except by chance, since the wind speed of a 700 year storm is a statistical value base on probability of that storm occurring in any year. So those values are not based on trying to predict maximum future wind speeds, since as you said it is very uncertain, but on trying to establish risk.

      As to the reduction of safety for a structure, it will depend on the location of the structure. If it is located where the 700 year storm wind speed is increasing there will be some increase in the risk. If it is located where the 700 year storm wind speed is decreasing there will be a decrease in the risk. It’s like insurance companies know how long the life expectancy is for each age group but they don’t know how long an individual will live. And that life expectancy for each age changes with time, depending on general health habits and other factors of the group.

      Hope that helps

8412. nigelj at 09:33 AM on 14 January 2020
      I had an intense conversation at work today.
      

      "i've had these encounters and most people just reset after they walk away;"

      Yes I have seen the same. 

      The way I see the whole denialist issue is we all have some natural healthy scepticism of new ideas, but get round to accepting them after hearing explanations etc. History shows this. Scepticism looks to me like it exists in many shades of grey from healthy scepticim to denialism, and its hard to know what category people are in, so we have to hope they are open to persuasion. Some will be some wont.

      They may say they agree and walk away and reset into denialism, but it could operate the other way where they vehemently disagree, but go away and vote for the Green party or whatever. I've seen one or two characters do similar things.

8413. ilfark2 at 08:30 AM on 14 January 2020
      I had an intense conversation at work today.
      

      awesome, but please follow up with him in a month and then in 6 months... i've had these encounters and most people just reset after they walk away; not to mention there's a chance the person won't tell you what they are thinking anymore since they probably don't want to upset you anymore... but hey, if they start campaigning for bernie, i reckon that'll be the proof in the pudding

      sort of funny it's a CCL person; most of those i know seem to think we've got decades to make drastic changes and are very naive about the way taxation and regulation work (if CCL had started in 1924, their methods might have had enough time to work)

8414. michael sweet at 07:42 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nigelj,

      It is off topic to continue that discussion.  I have had my say.  Read the link to Tamino.  I agree with Tamino.

8415. nigelj at 07:01 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Michael Sweet @65 , I don't accept that NP is concern trolling.

      Typical definitions of a concern troll "A concern troll is a person who participates in a debate posing as an actual or potential ally who simply has some concerns they need answered before they will ally themselves with a cause. In reality they are a critic."

      NP is clearly already "allied to the cause" because he is unequivocal in his worries about global warming and criticises denialists. Genuine concern trolls are somewhat more limited and nuanced in their acceptance (if any ) of AGW.

      How is NP demanding scientific accuracy and scientific sense being a concern troll? That would make all scientists concern trolls.

      You are seeing monsters under the bed :) Its because the denialists have us all on edge.

8416. nigelj at 06:51 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nick Palmer @61, yeah I agree that the exact middle ground people we need to win over get turned off by hyper alarmism. But we do need "evidence based alarmism" to motivate people to change. So its a nuanced juggling act.

      Barlows tirade of insults were way over the top and probably reflect his general frustration over the climate issue, that I think we all share. I find insults like that hurtful but I've come to realise its not me at fault.

      You mentioned "I came to see that there were sufficient people who cared to make a difference and I've seen many initiatives succeed in increasing recycling, protecting areas of wildlife, specific threatened species, certain types of air and water pollution etc and all without 'crushing capitalism' - which is unfortunately, an ideology that some 'extreme ecologists' get driven towards.....The extreme ecologist Barlow's of this world, who use 'fear porn' in their rhetoric in a bid to scare the public towards their favoured solutions - in Barlow's case I suspect he is deep down a Back to Eden type - are no doubt sincere in what they believe, but they then go on to believe that their back to nature/abandon industry methodology is the only solution."

      Agreed totally. I contribute a few comments over at RC and there is a certain character over there who promotes exactly this anti capitalism back to nature simplicity thing, and we have "locked horns" many times and its become divisive. I have received the same insults and worse than you received from Barlow. The guy in question means well, but just doesn't think things through.

      However there is room for a half way house, to the extent of more recyling, some frugality, less waste etcetera. My position is that capitalism is a good system, but is certainly causing some intractable problems, and its inherent in the current form of capitalism. But rather than "throw the baby out with the bath water", we need to somehow modify capitalism to work more sustainably without killing the good parts of capitalism. There are obvious ways to do this, but this is probably not the right thread for it.

      Of course all this enrages the back to eden types who want a simple sort of utopia that is a clean break from the current system. But such a thing is massively problematic. Eg:  if we stop using industry and large scale electricity generation, we have to burn wood. Where does a global population of 7.6 billion people get enough wood?

      Don't be too hard on Greta. Bright girl but remember her age.

8417. michael sweet at 06:30 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nick Palmer,

      I read your exchange with Steve Barlow and you look like a denier.  Barlow's position is much more reasonable than yours.  I note that you do not support your claims with citations and ignore Barlow's citations there also. 

      Using a review on SkS by Nigelj as support for your claims is not a substitute for citing peer reviewed papers.

8418. nigelj at 06:14 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      OPOF @60

      "Claiming more needed to be known before acting is like saying that new structural systems and materials should be used without detailed understanding of their acceptability. And claiming that someone other than the ones wanting to benefit need to do the research into the potential unacceptability. In fact, it is like claiming that research to determine the safe use of the system or materials is not required up-front (I am indeed stating that your argument is defending actions that have a significant risk of harmful consequences being allowed before the consequences are reasonably understood)....That is what you are arguing as a defence. "

      I dont think you can compare structural design and testing new materials to our use of fuels in the past. In the 1970's we had already been using fossil fuels for decades, and along comes some information that they could be a problem, but it was very preliminary information. It didnt look like enough to stop using fossil fuels, especially as 1) the agw thing was uncertain back then 2) there were no well developed alternative fuels, and 2) it was unclear if warming was a danger. Arrhenius claimed it was a benefit (erroneously as it turns out).

      We just didn't have much to go on back then, regardless of the interests of powerful people.  And yes of course some of them always try to downplay environmental problems.

      I agree about the precautionary principle as a useful tool, but you do need a fairly clear threat to use it, otherwise we would not get out of bed in the mornings.

      Remember what we had in the 1970s, a hypothesis that industrial emissions could lead to warming with no atmospheric experiment to really back it up. We literally had to wait to see if the atmosphere warmed, and if this could be attributed to CO2. J Hansen established there was a problem around 1990 and so I think that was the time to act. Bear in mind we still arent 100% sure of the risks, so have to still apply the precautionary principle. Getting that through to people is still frustratingly difficult.

      However your argument is thought provoking, and a force to be reckoned with.

8419. michael sweet at 06:04 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nick Palmer at 61: "[I] et labelled by themn as denialsist or a 'concern roll'(sic)". 

      Tamino says to you here "You seem WAY too eager to accept the one number that will make the bushfires unprecedented, while ignoring the testimony from so many experts (including firefighters and scientists who specifically study bushfire) and from people who lived through both times in Australia."

      It is rare for Tamino to comment to posters in this way.  

      Greta Thunberg is the most successful climate activist in the world today by a lot.  She was Times Person of the Year.

       

      You are a concern troll.  

8420. nigelj at 05:40 AM on 14 January 2020
      2019 in climate science: A continued warming trend and 'bleak' research
      

      richieb1234 @15, if we used ocean heat content the denialists would probably say "and look that leads to just 1 degree, of warming" (or some other small number)   and all the usual related blather. So we end up back where we started.

      It might also create the impression we are trying to scare people by cherrypicking the most scary looking data, and if people start to think we are selectively doing this, scientists credibility gets shot to pieces.

      The best thing is just to stick to the obvious thing people relate to which is temperatures like MS points out. Clearly 1.5 or 2 degrees doesn't sound very scary  until you look into the consequences and how serious they are. I also like to point out that if we don't stop temperatures getting to 1.5 degrees, it could lock in tipping points that might take us over 5 degrees c eventually and 5 degrees should get peoples attention.

      I totally understand your frustrations and I have experienced all the same things, but I think we just have to stick to the conventional approach and hope it convinces enough people. Once we try to be too clever in our approach to the thing it could backfire.

      Denialists are frustrating. Even if we only convince a few of the hard core denialists its something, and it will probably only be a few.

      Also people won't tell you if you are being persuasive, because people are too proud to publicly admit they have changed their mind. This doesn't meant they haven't changed their mind.

8421. Nick Palmer at 05:07 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      michael sweet@62 "Anyone who says Greta Thunberg is using "extreme rhetoric" is a concern troll. Greta constantly cites the IPCC reports when she speaks"
      
      Where in the IPCC reports does the IPCC call for total divestment and ceasing of investment in fossil fuels right now?
      Greta's latest heading for, later this month, the 50th anniversary of the World Economic Forum in Davos, Switzerland.
      
      "We demand that at this year's forum, participants from all companies, banks, institutions, and governments immediately halt all investments in fossil fuel exploration and extraction, immediately end all fossil fuel subsidies, and immediately and completely divest from fossil fuels," the op-ed declares. "We don't want these things done by 2050, 2030 or even 2021, we want this done now—as in right now.""
      
      https://www.commondreams.org/news/2020/01/10/greta-thunberg-and-20-youth-climate-activists-call-davos-attendees-abandon-fossil

8422. Nick Palmer at 04:56 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      "When lots of people call you a "concern troll"
      Hardly anyone has - about two in 30 years... - stop making stuff up!

8423. michael sweet at 04:27 AM on 14 January 2020
      2019 in climate science: A continued warming trend and 'bleak' research
      

      Ritchieb,

      I understand your frustration.  Imagine how Michael Mann and James Hansen feel after trying to deal with this issue for 30 years.

      The Earths energy imbalance and ocean heat content have only been accurately measured for a few years, less than 2 decades.  There are no proxies to extrapolate the data into the far past.  There are still large error bars for these measurements.  The deep ocean (over 2,000 meters) is poorly measured.

      By contrast, there are accurate thermometer temperature measurements going back to 1880.  Proxies have been found that accurately go back over 800,000 years and much further with poorer resolution.  There is a reason deniers deny the Hockey Stick graph so much.  Current estimates of the world temperature anomaly have error bars of hundredths of a degree.  People do not understand what 2E18 joules means.  I have a very strong scientific background and 2E18 joules does not have much meaning to me except it is a lot of energy.

      As you point out, many people do not recognize that 2C will have big effects.  I remember 10 years ago I wondered if I would live to see obvious sea level rise, more fires, increased storms, Antarctica melting and other effects (I expect to live to 2045).  Here in just 2020 we see all of those effects already.  Scientists seriously underestimated what effects 1C would have.  Remember that only a 5C decrease in temperature means a mile of ice over New York!  The last time carbon dioxide was over 400 ppm sea level was 20 meters higher!! (that will not happen overnight, do you care about your decendants in 300 years?).

      It was recently pointed out here that 2C world average means 4C over land which is 7.2F over the entire USA!!  I knew all the math but had not connected all the dots to see how much change F 2C really was.  We are heading for most likely 3C by 2100 (more after that!) which is 11F every day all summer!  Are your audiences really prepared for 11F?  How could you visit Los Vegas half the year?

      The deniers will deny whatever measurement scientists make.  EEI and OHC would make no difference.  I try to focus on the effects we all currently see.  Point out that they will get worse over time.  Here in Florida people moan about 10 inches of sea level rise.  Can Miami Beach continue to exist when they already have 8 inches of water in the streets?  Fires worldwide are obvious and people know about them.  Storms like Harvey, Florence and Sandy are unprecedented and people worry.  They have had three 500 year storms in the last 3 years in Houston.

      If you are speaking to the public use the numbers you are most comfortable with.  One talk I heard used pictures of people and had no data.  The speaker found people did not relate to data no matter what it described but related to stories of people whose homes were flooded or Koalas killed in the thousands.  One moving picture showed the speakers' friend who lost their home in the Paradise fire and is now a climate refugee in the USA.  This October I went diving in North Cuba and Cozumel, both world class coral reefs.  Over 90% of the coral was dead in both areas.  

      Use what you find relates best to people.  If you find you are successful in reaching people come back here and tell us what works best for you.

8424. michael sweet at 03:44 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nick Palmer:

      When lots of people call you a "concern troll" you need to consider if they are correct.  

      Anyone who says Greta Thunberg is using "extreme rhetoric" is a concern troll.  Greta constantly cites the IPCC reports when she speaks.  When you ignorantly call the IPCC "midballing" you demonstrate you do not know what you are talking about.  Read more of the background material.

8425. kricklin at 03:23 AM on 14 January 2020
      I had an intense conversation at work today.
      

      A followup - I wonder if your co-worker will be responding to you again.  My experience (online) is patience, knowledge, courtesy are key to having meaningful dialogue, but I've not had any success getting others to accept climate science.
      
      Thanks - Ken

8426. kricklin at 03:20 AM on 14 January 2020
      I had an intense conversation at work today.
      

      Well done Claire. 

8427. Nick Palmer at 01:31 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      nigelj@54 wrote: "However in these posts I always mention that I think climate change is deadly serious and why, to try and get across that I'm not minimising the problem, but that we just need accuracy"

      100% yes!! It's the lack of accuracy in the rhetoric that motivates me to take on 'difficult' people, both denialst or doomist or left or right and all of the various combinations. I try to explain to the hyper-alarmists that their overblown rhetoric is actually a significant problem to getting the public on board and get labelled by themn as denialsist or a 'concern roll'. It's frustrating because I know that any undecided more reasonable readers who may be following can be turned away from the sensible middle path by the prejudice and misinformation on display

      Thank you for taking the time to 'judge' the Barlow/Palmer contretemps. I must say I have never been so insulted by someone who is nominally on 'our side' before and that is why I needed a little confirmation that it wasn't me who had gone too far down a path...

      I accept what you say. It's interesting that you sense that Barlow is/was an ecologist type. In my own 'environmentalist career' I started out completely believing the imminent tales of ecological doom spread by such as Greenpeace and Friends of the Earth - indeed I was a local groups FoE 'coordinator' throughout the 90s. I very much thought that modern society had us on a one way irrecoverable trip to ecocidal hell with the job of our organisations being to slow down the damage as much as possible while fearing the worst would happen. In one sense I go a little easy on Steven Barlow and others like him because I (kind of) was like him several decades ago - I know his arguments well because they were also close to mine before I wised up (I think) a little...

      I came to see that there were sufficient people who cared to make a difference and I've seen many initiatives succeed in increasing recycling, protecting areas of wildlife, specific threatened species, certain types of air and water pollution etc and all without 'crushing capitalism' - which is unfortunately, an ideology that some 'extreme ecologists' get driven towards.

      Are there still large ecological problems? Sure, and climate change will have many large impacts if we don't get on top of it, but the years have made me more optimistic about how the human race can handle big problems, once it is aware they are genuine and not over-hyped, as many things have been in the past.

      The extreme ecologist Barlow's of this world, who use 'fear porn' in their rhetoric in a bid to scare the public towards their favoured solutions - in Barlow's case I suspect he is deep down a Back to Eden type - are no doubt sincere in what they believe, but they then go on to believe that their back to nature/abandon industry methodology is the only solution. I mentioned earlier on that there were 'sufficient' people who cared enough to forego the trappings of civilisation to 'save the world' but I have come to believe, at least in the West, that that figure is only about 20-25% of the general population. Try and impose policies that threaten the lifestyles, ambitions and aspirations of the large amjority too much and one will probably come up against what the President of the Finance and Economics Committee of my then government explained would be (metaphorically) a lot of angry people with swords fighting back!

      That is why I reject the increasingly extreme rhetoric that Greta Thunberg, and her back seat driver advisers, are drip feeding out to the public that we have to drop fossil fuel use almost overnight - see the link...
      https://www.commondreams.org/news/2020/01/10/greta-thunberg-and-20-youth-climate-activists-call-davos-attendees-abandon-fossil

      I accept the view of many economists that such draconian action would immediately precipitate the world into a colossal mother of all global economic crashes. I think that's why IPCC targets allow for continued (but steeply reducing) use of fossil fuels as late as 2050. I think that is sensible. It's hard not to see, because of this relatively new development, that behind the Thunberg speeches that there is more than a hint of some politically minded influencers trying to engineer the destruction or hobbling of capitalism.

      I worry that if such extreme action gets validated and taken on board by her many followers that the great mass of the population will be repulsed by it in short order.

      In my view over-hyping dangers, calling for extreme and immediate one dimensional 'solutions' runs a grave risk of immunising the public against more measured action, and in this respect I think it a comparable to (or possibly greater, these days) problem than out and out denialism, which I think has recently moved into a new phase. In public fora and media they less and less actually deny the science directly any more but instead focus on cherry picking extreme media statements by alarmists and polticians, and innacurate 'shock horror' journalism, which they then knock down to smear the actual science in the minds of the public by proxy.

8428. One Planet Only Forever at 00:21 AM on 14 January 2020
      The never-ending RCP8.5 debate
      

      Nigelj @58,

      Another way to respond to "But the problem wasn't clear. There was nothing to act upon."

      The significance of the issue to the future of humanity was not in question.

      Claiming more needed to be known before acting is like saying that new structural systems and materials should be used without detailed understanding of their acceptability. And claiming that someone other than the ones wanting to benefit need to do the research into the potential unacceptability. In fact, it is like claiming that research to determine the safe use of the system or materials is not required up-front (I am indeed stating that your argument is defending actions that have a significant risk of harmful consequences being allowed before the consequences are reasonably understood).

      That is what you are arguing as a defence. And the undeniable reality of how harmful it is to allow actions to not be restricted 'because not enough is known about them to be sure they should be restricted' is understandably absurd, potentially repugnant (Absurd and Repugnant are the technical terms used in ethical arguments).

      My point remains that the power players of the 1960s and 1970s were already fighting against being responsibly restricted, to maintain their understandably undeserved status and opportunity to increase their status.

      Sustainable Development awareness and understanding was and continues to be a response to that absurd and repugnant reality. And it can undeniably be claimed to be divisive. There is undeniably a helpfully correct side of expanded awareness and improved understanding, and a harmful side needing to be helpfully corrected or governed and limited.

8429. richieb1234 at 21:10 PM on 13 January 2020
      2019 in climate science: A continued warming trend and 'bleak' research
      

      As a relative newcomer to the climate change issue, I find it surprising that our preferred figure of merit is global mean surface temperature (GMST).  Is it advisable for the IPCC to state their goals in terms of limiting global warming to a GMST rise of 1.5 degree C, or even a 2.0 degrees?  People I talk to are not alarmed by those figures.  They see that much change every day of their lives. 

      Climate deniers find it very easy to raise doubt about whether the temperature measurements are accurate; whether calculating a global aveage is meaningful; whether that small a temperature difference is dangerous; and whether "that small an effect" is just due to natural fluctuations. We end up debating whether models are validated and how much committed heating there is.  [Have we already passed 1.5 degrees?].  It sometimes seems like a losing battle. 

      Moreover, none of the consequences of global warming arise from GMST.  They arise from the addition of heat to the oceans, the ice sheets, the soil and the atmosphere.

      Wouldn't Earth's Energy Imbalance (EEI) or ocean heat content (OHC) be more compelling figures of merit?   These numbers are enormous; the equivalent of detonating a nuclear weapon every few seconds.  They are more easily attibutable to fossil fuel.  They have direct impact on consequences such as sea rise, ice melting and drought.  And future projections are less dependent on models.

      I would be vey interested in hearing other opinions on this question.

      Very Respectfully, --Richieb1234

8430. eschwarzbach at 19:41 PM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming Digest #2
      

      Unfortunately the simulation title is incorrect, making the wonderful video unusable in arguing with deniers. The title should make it clear, it is about anomaly, or more understandable, deviation from a base.

8431. John ONeill at 18:44 PM on 13 January 2020
      Is Nuclear Energy the Answer?
      

      Michael Sweet - sorry, that was just an error, not an insult. The beryllium was proposed for Advanced Gas-cooled Reactors, but not used in the end. Sorenson's Flibe reactors are currently just one of many paper reactors. So apart from very small amounts for welding flux, and only in Candu fuel rods, my statement is correct. 

8432. nigelj at 16:49 PM on 13 January 2020
      I had an intense conversation at work today.
      

      Great attitude Claire. This is a model of how to talk to climate sceptics and denialists, in that context anyway. I take my hat off to this woman and learned a lot. 

8433. One Planet Only Forever at 14:47 PM on 13 January 2020
      The never-ending RCP8.5 debate
      

      nigelj @58,

      A pretty clear presentation regarding the understanding of the behaviour of the wealthy and powerful prior to 1985 is the following blunt statement made in the 1987 UN Report "Our Common World".

      "25. Many present efforts to guard and maintain human progress, to meet human needs, and to realize human ambitions are simply unsustainable - in both the rich and poor nations. They draw too heavily, too quickly, on already overdrawn environmental resource accounts to be affordable far into the future without bankrupting those accounts. They may show profit on the balance sheets of our generation, but our children will inherit the losses. We borrow environmental capital from future generations with no intention or prospect of repaying. They may damn us for our spendthrift ways, but they can never collect on our debt to them. We act as we do because we can get away with it: future generations do not vote; they have no political or financial power; they cannot challenge our decisions.
      26. But the results of the present profligacy are rapidly closing the options for future generations. Most of today's decision makers will be dead before the planet feels; the heavier effects of acid precipitation, global warming, ozone depletion, or widespread desertification and species loss. Most of the young voters of today will still be alive. In the Commission's hearings it was the young, those who have the most to lose, who were the harshest critics of the planet's present management."

      That was a polite-political way to say what the rich and powerful were aware of and what the worst among them were doing. And that was not just realized in 1987 (or in 1985). That was an observation regarding a history of behaviour.

      And that type of unacceptable behaviour by the harmful among the rich and powerful continues today, risking a worsening of the current day potential future that appears to only be as bad as RCP6.0. Humanity would have been on a much better path if there had been responsible leadership that did not allow risky harmful and undeniably unsustainable behaviour to continue to increase, especially not allowing already rich people to get even richer from it.

      The efforts to raise doubt about the risks were already starting at the time of the Stockholm Conference. The people willing to personally benefit through actions that are likely to be harmful to others have always been a problem. The future of humanity requires that problem to be sustainably solved.

      The efforts to expand awareness and improve understanding and apply that learning to develop sustainable improvements for humanity led up to the Stockholm Conference and also triggered the efforts to fight against limits being imposed.

      The basis for the 2015 Sustainable Development Goals includes the detailed understanding of the planetary boundaries of human impacts as presented in 2009 by Rockstrom et.al. in "A Safe Operating Space for Humanity". Of the 10 identified Planetary Boundaries, Biodiversity Loss and Nitrogen Cycle impacts were already exceeding the sustainable impact limits (as the research for the 2009 book was done). And Climate Change impacts had already reached approximately 2/3 of the sustainable planetary impact limit, and RCP6.0 significantly exceeds that limit.

      But global leadership was well aware that very significant harm was being gotten away with. The 2009 report was not a shocking new revelation. And the 1987 "Our Common Future" makes that abundantly clear.

8434. nigelj at 11:44 AM on 13 January 2020
      The never-ending RCP8.5 debate
      

      OPOF @57, the best that can be said is wealthy and powerful knew there 'might' be a problem in the 1970's. But the problem wasn't clear. There was nothing to act upon. You are stretching the precautionary principle a long way.

      Did the wealthy and powerful try to stop research into the problem? Or hide its significance? There is definitely evidence the oil companies thought there was a problem in the 1980s but were not upfront with the public. So the public were denied full information. However I doubt it would have lead to action, because it was just modelling at that stage, and there were no significant rising temperatures.

      I think evidence of climate change hardened up around 1990 and that is when the wealthy and powerful really marshalled their forces, in a strong campaign of denial like a loose federation of various interests preaching from the same hideous song book.

8435. One Planet Only Forever at 09:09 AM on 13 January 2020
      The never-ending RCP8.5 debate
      

      Nigel @56,

      I do not dispute that the average person in the 1970s was not being made aware of the concern about fossil fuel use. Actually, that is the point of my comments.

      Global Leadership (primarily in politics and business) failed to responsibly expand awareness and improve understanding and apply that learning to limit the harm being done to the future of humanity and help develop lasting improvements for humanity. In particular there has been a failure to cautiously responsibly limit the pursuit of fossil fuel profiteering while better understanding of the magnitude of the harm was developed. The worst among the wealthy and powerful took the damaging approach of fighting against limits on the risky harmful activity, claiming the need for more certainty and trying to mislead the public. That harmful flawed behaviour has occurred regarding almost every popular and profitable harmful unsustainable activity that humanity has ever developed.

      The Stockholm Conference and the coordinated global development of better understanding since then are evidence that in the 1970s global leadership was aware and understood of many issues that had the potential for serious risk of future harm, including climate change due to fossil fuel use.

      The wealthy and powerful knew about the potential problems in the 1970s. How they behaved is my point, and is a valid criticism by anyone regarding any of the many unsustainable and harmful developments that have occurred since the 1970s. Being aware of the potential for harm, the collective global leadership (all of the wealthy and powerful) should have tried to keep the already more fortunate people from trying to become even more fortunate through the increased use of fossil fuels until more was understod about the consequences. If that had happened the future for humanity would be less harmed than it is today and there would be less resistance today to any corrections that are still required.

8436. nigelj at 05:49 AM on 13 January 2020
      The never-ending RCP8.5 debate
      

      One Planet Only Forever @55, I just disagree that back in the 1970s and 1980s humanity was aware of the climate problem with some degree of certainty sufficient to do something. This is from a related article on the Stockholm conference in the 1970's:

      
      unchronicle.un.org/article/stockholm-kyoto-brief-history-climate-change

      "In a section on the identification and control of pollutants of broad international significance, the Declaration raised the issue of climate change for the first time, warning Governments to be mindful of activities that could lead to climate change and evaluate the likelihood and magnitude of climatic effects.The UN Scientific Conference also proposed the establishment of stations to monitor long-term trends in the atmospheric constituents and properties, which might cause meteorological properties, including climatic changes. Those programmes were to be coordinated by WMO to help the world community to better understand the atmosphere and the causes of climatic changes, whether natural or the result of man's activities."

      This is clearly saying there might be a problem, but more work is needed to figure it out.

      In addition I did physical geography at university in the 1980s and the textbooks definitely did not say there was a serious climate problem being caused by industrial emissions that is known to cause a lot of warming etc. They accepted its likely that industrial emissions would have an effect, but the world was in a cooling period and this created some uncertainty. The majority of the science at the time did predict warming, but we were stuck having to see if this actually happened. We needed that real world certainty to confirm the predictions. 

      But by the early 1990s we were much more sure.

      Agree about the rest of your comments.

8437. One Planet Only Forever at 05:47 AM on 13 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      Hank @41,

      That change of the way the US code works that you mention will result in the same reduction of safety as the climate conditions get worse that I have mentioned.

      The reality remains, everything already built is less safe as the climate conditions become more severe. Even things designed to the updated requirements will become less safe as the climate conditions become more severe. Admittedly, there is potentially an over-statement of the design requirements that will make new designs even safer under current conditions. But how significant the over-statement is and how much climate change impact continues to be created will determine if and when the over-statement is no longer an over-statement, after which time the design level of safety becomes less than the desired minimum as climate changes continue to be increased.

      Does the code identify how much it is over-stating the design requirement and indicate the related amount of global warming that the over-statement is expected to be valid for? Is it good for 1.5C, 2.0C, 3.0C warming? And if it claims to be good for anything beyond 1.5C warming I would really be interested to see the basis for being so certain about that. Everything I have seen appears to indicate that significant uncertainties exist if there is more than 1.5C warming.

8438. nigelj at 05:18 AM on 13 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      Hank @40, yes I might have unintentionally done that. For the record I don't see any evidence engineers have been derelict in their duty protecting the public from climate change, and other threats. Theres something a bit weird going on where I live, but I suspect it reflects entirely on other parties not engineers. I have worked with dozens of engineers, enough to get a general view and ok its anecdotal, but In New Zealand they push for high standards and treat the codes with respect. I wont bring up the issue again either.

      That said we have to be able to "talk about stuff" even if its contentious,  and not get too defensive. It just needs us all to be clear on exactly what we mean and have the evidence.

      Yes I comment on RC and I recognise your name.

8439. One Planet Only Forever at 05:18 AM on 13 January 2020
      The never-ending RCP8.5 debate
      

      nigelj @54 (and others),

      Discussions regarding what global leadership was aware of and understood in the 1970s should be based on a comprehensive understanding, particularly regarding what is required to develop sustainable improvements for humanity.

      It is not correct to believe that “The state of the science in the 1970's and 1980's was definitely too uncertain for us to conclude we were warming the climate and should do something.”

      In the 1960s global leadership understood that increasing atmospheric CO2 due to fossil fuel use was a concern. The 1972 Stockholm Conference compiled what was understood to be going wrong and what required expanded understanding of the directions of development and corrections required to sustainably improve the future of humanity. The report included the concern about increasing atmospheric CO2.

      Perceptions of success that rely on harmful and unsustainable activity, like fossil fuel use, are undeniably unsustainable. Fossil fuel use is making the future worse. That has been understood for a long time. The fact that such a fundamental undeniable understanding is still not generally understood in the powerful and supposedly more advanced populations today indicates that the developed socioeconomic-political systems over-developed in the wrong direction. They require significant correction, not a continuation of Kumbaya-style compromising in an attempt to have 'everyone get along with everyone allowed to believe what they want and behave as they wish'.

      The identified concern about fossil fuel use in 1972 should have been sufficient to result in global leaders cautiously restricting the pursuit of increased benefit from fossil fuel use, especially by already more fortunate people, until more was understood about the consequences. There was plenty of discussion by global leaders about it in the 1970s, even though more focus was put on concerns that more immediate threats to humanity like the ozone layer impacts, tobacco use, and vehicle safety.

      Increased pursuits of benefit from fossil fuels since the 1970s by people who were already living better than basic decent lives has tragically strengthened the resistance to correction. Powerful people who unjustifiably benefited more from continued and increased global use of fossil fuels almost certainly hoped would that increased resistance to correction would develop.

      Efforts by undeserving powerful wealthy people to raise doubts about 'climate science and the required corrections' and to discredit climate scientists (and the related scientists in fields affected by climate change), increased when global leadership was starting to responsibly restrict the continuation of that harmful behaviour by undeserving powerful people. The undeserving powerful people collectively mobilized their resistance. Their actions included:

      • getting political-minders involved in writing IPCC reports to push the wording as far away from supporting the need for corrective action as they could get away with. And they mobilized misleading marketing to popularize misunderstanding and unjustified doubt.
      • A coordination of actions to create the Climategate Scandal (theft of emails, the effort to comb through them for nuggets to abuse in misinformation programs, and the development and distribution of the misleading marketing).
      • Fighting to have national leadership restrict the science being publicly developed and presented. The Harper-led Conservatives in Canada selectively muzzled scientists and redirected federal research funding away from improving understanding of the negative impacts of climate change when they had the power to do so. The Bush and Trump led USA acted in similar ways, as have similar groups in other places around the planet (including Putin's Russian group).

      There is an identifiable global political faction that is a significant part of the problem, being deliberately correction resistant, being as harmful as they can possibly get away with. And it is correct to identify the 1970s as a point in time when that collective started to 'globally coordinate their efforts against the expansion of awareness and improvement of understanding of the corrections that climate science (and other sciences) had identified are urgently required to stop making the future worse'. There is little doubt that what has developed today is more harmful to the future than what had been developed by the 1970s, in spite of it appearing that RCP8.5 is no longer the likely rate of making the future worse.

      What is now required, and will be required at all future 'Nows' and was required in previous 'Nows', is leadership responsibly limiting how much worse the future will be, and actually acting to help sustainably improve the future. And that limiting of the harm done to the future, and helping improve the future, now includes justifiably 'reducing' the perceptions of superiority of those who unjustifiably significantly increased their benefit from the use of fossil fuels since the 1970s. The more recently the benefits have been obtained, and the wealthier the beneficiary is, the more the perception of superiority deserves to be lost.

      That may be unpopular. And it may anger many people. But it is undeniably the correct understanding.

      Compromising awareness and understanding to 'get along with people who are harmfully unaware or have developed a harmfully incorrect belief/opinion' is not helpful. There are many issues where diversity is to be embraced. Awareness and understanding regarding climate science is not one of them.

      The use of fossil fuels makes things worse. A possible exception would be fossil fuel use as a temporary transition measure to raise a desperately poor population up to a starting level for sustainable development.

      An improving future requires an end to the harmful climate change impacts of fossil fuels use, the sooner the better. And the most fortunate need to be leading the correction, including wealth from fossil fuel use being exclusively used to assist the desperately poor sustainably improve their life circumstances. And any more fortunate person that can be shown to be resisting that effort deserves a serious loss of status.

8440. nigelj at 05:08 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      Just want to make a general comment related to Mathiew #1. The way the climate denialists work is they try to goad warmists into making exaggerated claims and mistakes, then they can say "look you got that wrong", and by implication you are wrong about everything. Dont fall for it. For example some people have claimed none of these fires are caused by arson, when commonsense should tell them a few probably are.

      Better to concede a few are caused by arson, but it remains unconfirmed, and mention accidents, and lightening strikes as well in more isolated areas, and that global warming leads to a longer fire season and larger areas being burned.

      Ask the denilaists a simple question. How would a hotter climate not make bushfires worse?

8441. william5331 at 04:34 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      Some time ago I read an article on Australian weather history as determined by examining the yearly rings of Calcium carbonate in stalictites and stalicmites.  They suggested that Australia experiences a 200 year cycle between 'wet' and dry periods and said that Aus is now going into a dry period.  Perhaps this exacerbating the overall effects of climate change.  If the last two hundred years was a wet period, what must a dry period be like.  https://www.sciencedaily.com/releases/2019/07/190708122343.htm

8442. John Hartz at 02:18 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      Also see:

      Australia's indigenous people have a solution for the country's bushfires. And it's been around for 50,000 years by Leah Asmelash, CNN, Jan 12, 2020

8443. Tom Dayton at 02:08 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      See also Hotwhopper about Australian arson.

8444. Tom Dayton at 02:06 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      Nick Stokes posted data and sources about Australian arson.

8445. Joel_Huberman at 00:53 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      One can explain to skeptics that, even if every single one of the fires was caused by arson, the years of drought and current record-high air temperatures have created conditions where the arsonists' fires generate far more damage than would have been the case with normal rainfall and normal temperatures. 

8446. Mathieu18981 at 00:39 AM on 13 January 2020
      2020 SkS Weekly Climate Change & Global Warming News Roundup #2
      

      Sadly this attempt to close the lid on this arson lunacy is more in itself a denial than an argument. I have no material to confront my skeptics friends with numbers and proofs of bushfires policies and actions. 

      A link with australian official number about firebreaks and bushfires preventive activities would be sufficient to prove skeptics wrong. The case is simple, if there is no reduction or an increase in preventive activities the debate is won. 

      If there is a decrease there is a case for more discussion on the causes. The article i read and its links simply push aside any skeptic's claim instead of attempting to debunk. Like always it will increase even more theirs feeling of confidence that we live in a bubble.

8447. Hank11198 at 22:40 PM on 12 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      OPOF @38

      “The same applies to structure performance. The design codes establish a minimum factor of safety against performance failure. The factor of safety is a combination of increasing the expected forces on the structure (factors greater than 1.0 are applied to that loads) combined with reducing the structure resistance values (factors less than 1.0 are applied to material resistance properties).”

      In the US the factors of safety you mentioned (we call them load factors) have been reduced to 1.0 for wind. The wind speed maps were then increased to compensate for the load factor reduction. This now produces a procedure where the design wind speed is the actual wind speed the structure is designed for without yielding instead of a lower wind speed with a safety factor. I like this change as it seem more transparent to our customers. In other word what you are told is what you get.

8448. Hank11198 at 22:32 PM on 12 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      Nigelj @ 39

      Nigelj I have seen you post at different climate blogs and agree with you almost 100% of the time. I do not think you would intentionally disparage engineers. However I do think in this case you un-intentionally created an impression that engineers have been derelict in their duty to protect the public by not addressing climate change. It appears some of the differences in our understandings is due to living in different countries with apparently different systems of producing design codes. It may also due to my frustration in trying to defend scientists against climate change deniers who continuously accuse climate scientists of fraud and deception. Regardless this is the last I will comment on this subject.

      BTW I have seen you post on realclimate (I assume you are the same person). I sometimes post there under the name of TPaine.

8449. nigelj at 12:51 PM on 12 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      Hank @36,

      "The study I link too stated a 1 to 10% increase in intensity for a 2C warming with the probability that the strongest storms will be less frequent."

      Ok that changes the complexion a bit. My understanding is research is suggesting a higher frequency of the strongest storms. For example its  interesting that numbers of category 5 hurricanes seem to have increased as below. Some people are suggesting we need category 6 hurricanes. And this is why I was concerned about the whole wind speed thing.

      www.wunderground.com/education/webster.asp

      Anyway I agree it all needs further investigation, and that current code standards in America look good, and theres no point in a panic over design reaction. 

      “It looks like our codes are weighted a long way towards lowest cost. However I doubt that has anything to do with the engineers on the committees that develop codes”. What? How can the codes be weighted towards lowest cost without the engineers who write the codes being responsible? "

      My understanding is our structural building codes in New Zealand  are designed to some extent by a committee process that includes not just structural engineers, but builders, representitives from building research organisations etc and the code has to be approved by politicians at the end of the day. It just sounds quite different from your system. Engineers do the detail work, but it appears other parties have some input. We are also not as litigous as you guys. Not saying our system is better than yours, the opposite could well be true. Anyway you can see there are several input factors that could be aiming for minimising costs and standards rather than the engineers.

      "If I have taking things the wrong way then I apologize. "

      Apology accepted.

      "And saying our building codes are weighted towards lowest cost without evidence is doing exactly that. "

      I was talking about New Zealand! I thought that was reasonably clear. Sorry for any confusion.

8450. One Planet Only Forever at 11:05 AM on 12 January 2020
      Doubling down: Researchers investigate compound climate risks
      

      michael sweet @35,

      The 'flood concern' is a valid one. And it allows a clarification to be made regarding structural performance.

      In addition to structure design which need to account for rain ponding on roofs, I have designed surface run-off systems. These systems get designed for events that are based on historical weather data for a region. And there is a level of safety against that design failing to perform so that the design will withstand events that exceed the maximum expected design condition. What that means is that if climate change increases the severity of rain events there is an increased likelihood of the system failing to perform adequately. The system becomes less safe than the desired safety level of the design.

      Updated design requirements will result in 'new designs' meeting desired safety standards. But anything designed base on the previous requirements will become 'less safe'. There is no way of arguing around that. It is the reality. Existing surface run-off systems all become less safe if the weather conditions they may experience become more severe.

      The same applies to structure performance. The design codes establish a minimum factor of safety against performance failure. The factor of safety is a combination of increasing the expected forces on the structure (factors greater than 1.0 are applied to that loads) combined with reducing the structure resistance values (factors less than 1.0 are applied to material resistance properties). Updated design requirements establishing higher design loads will result in new designs having the desired safety. But structures designed to the previous requirements will be less safe, they will have an increased chance of a failure of performance.

      And as I have stated in other comments, there is no real value in discussing exactly how much less safe things are going to become. Many structures are still standing many years beyond a '50 year design basis'. The fact that human caused climate change is making almost all existing structures and surface run-off systems 'less safe' should be sufficient to  motivate responsible leaders of society to rapidly correct the incorrect activities that are making things 'less safe'.

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