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Comments 27901 to 27950:

  1. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Mancan18,

    Jacobson account for increased demand in the USA in this paper.  Total power use is lowered because electric motors are much more efficient than internal combustion engines.  In the supplementary material and online here they describe how all nations in the world can convert to 100% renewable energy by 2050 including increased demand by 2050.

    The remainder of your post seems to be your personal opinion.  Can you link some peer reviewed material to support your ideas?  I think if you read the article summarized here you will find that they address many of your concerns and show how they can be solved.  This short summary has necessarily left out a lot of the details.

  2. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Mancan, do we need to go to zero emissions? My understanding is that we need to dramatically reduce emissions, but if the West (responsible for most of the excess CO2 in the atmosphere) drops to zero, then the developing countries can use more FF and make the transition later. What is certain is that sooner or later the whole planet must transition from FF since they are a finite resource.

  3. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Stranger, thin-film solar cells use tellurium, but the normal solar PV installations do not (and CSP does not).

    I am well aware that turbines use those metals, but do you have data to support use per MW is higher in wind turbines than in modern steam turbines? (I dont know, I am asking). The claim that they are "essential" is also false, (building a generator with soft-iron electromagnet is something done at high school) but I am sure they improve cost/MW.

    PS. I note that Enercon are already building wind turbines with only electromagnet - see here. Note that tech works for turbines from 350kW all the way to 7.5MW which must be among the world's largest.

  4. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Sadcap scaddenp, Neodymium, terbium and dysprosium are essential ingredients in the magnets of wind turbines.

    Solar panels need tellurium

    http://blogs.ei.columbia.edu/2012/09/19/rare-earth-metals-will-we-have-enough/

    Moderator Response:

    [JH] Link activated. 

    [RH] I believe you're addressing scaddenp, not "Sadcap." 

  5. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Interesting article but only seems to concentrate on the US.

    However, I'm not sure that it deals with all the issues.

    It seems from the article that transforming energy generation to 100% WWS is theoretically possible using existing technologies, despite all the land area, transmission, manufacturing, material recycling and cost issues that need to be considered.  However, I saw no mention of the increased generating capacity projections that will be needed. Local areas may well be able to be transformed to 100% WWS, however, it does not overcome the basic problem of reducing fossil fuel emissions to zero from the current global 83% reliance on using fossil fuels for power generation, while at the same time meeting the global demand for power in the future. In the 1950s, the global demand was about 3 TW. By 1990 it had risen to 12 TW. Today, it is 18 TW and it has been projected that  capacity will need to rise to over 30 TW by 2050. Simply saying that we will need to reduce demand is not an answer. That means dooming many developing countries to a permanent state of poverty.

    More efficient technologies and methods are needed if we (the human race) are to reduce our reliance on fossil fuels. We most certainly need to reduce our emissions. However, if we are to realise that 30 TW figure by 2050 while keeping our emissions down to a level that will keep  temperature increases below 2 degrees won't be an easy task. We will need all technologies, not just WWS. We will also need 4/5th generation nuclear, like the thorium reactors which consume all nuclear waste. We will need hydrogen as well as more efficient WWS technologies. We will need each private residential household to be self-sustaining and contribute any excess capacity back to the grid. We will need more power efficient consumerables. We will need to rebuild our infrastructure where our concrete urban areas and road systems become solar energy sinks and the water from our urban drainage systems can also be used to generate power. Even new corporate entities, where the price of a share could also include the technology to make your household self-sustaining and able to  contribute to the grid, may also need to be explored; rather than simply relying on old corporate models, where the company builds a power station, whether it be a solar array, a wind farm, a nuclear power station or a coal fired power station, and sells power through the grid. It seems all technologies will be needed if we are to get anywhere near what will be required globally. It should be the high tech first World nations that are leading the way. Unfortunately, there are too many political ideologues stopping them from doing so to the extent that is needed, because they don't even recognise that there is a problem. In doing so they are threatening the very way of life that they want to protect.

  6. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Stranger. "Since wind turbines and solar panels use so many rare earth elements". Can you expand this please? I didnt think conventional solar cells use any rare earth of significance, and usage in turbines would seem to be the same whether the turbine is driven by coal, nuclear, hydro, geothermal or wind? Electric cars are another story...

  7. PhilippeChantreau at 23:22 PM on 22 August 2015
    New paper shows that renewables can supply 100% of all energy (not just electricity)

    I think that apropriate technology can limit the amount of particulates emitted by biomass combustion. Jacobson et al proposes one specific scenario and attempts to show that the numbers can line up, and that's fine. However, what will happen in the real world will be another story.

    I don't know if either governments or utilities will ever be persuaded to not have a constant baseload, in which case EGS is the answer. I also find it a little skewed to ignore biomass because of pollution, when solar at the scale described in the paper will require mining minerals on a scale bound to create serious environmental problems. Of all the possible solutions, I find EGS and off-shore wind to be the least destructive.

  8. New paper shows that renewables can supply 100% of all energy (not just electricity)

    TonyW:

    In other papers Jacobson has estimated the amount of materials required for building out their renewable scheme.  Once the generating plants are built it will require less materials and energy to maintain them.  They will produce more than sufficient power to perform those activities.  They show in this paper that enough hydrogen is produced to supply all the needs of society (that is the point of the paper, all energy is produced).

    They have plans on their website for all nations in the world to convert to 100% renewable.  Obviously for any solution everyone has to adopt renewable strategies.  Currently China is ahead of the US in renewable adoption stragegies.  They require renewables to reduce their crippling air pollution.  

    This paper specificies what needs to be done for the largest economy in the world.  It follows that the rest of the world can adopt similar plans to reach the renewable target.  Plans will vary from country to country just as they vary from state to state depending on the local resources (Norway has a lot of hydro and Australia has a lot of sun).

    To me your objections amount to "I doubt it" without any data to support your position.

  9. New paper shows that renewables can supply 100% of all energy (not just electricity)

    @22 and 23 PhilippeChantreau and WRyan,

    WRyan is correct that Jacobson has pollution concerns about burning any carbon containing material.  It seems to me that the scheme described is an optimal system using renewables.  If you were to build trash to energy plants it would be easier to move to 100% renewable energy.  You would have to accept the pollution (which I think Phileppe and I do).  Likewise, if hydrogen airplanes do not work out you could make jet fuel from seawater.  If there are problems supplying baseload power, more EGS could be built.

    This is very positive to me.  It indicates that there is more than one way to get to the target of no fossil fuels.  If we started installing wind and solar as described in the OP, we could make adjustments in the future as issues were discovered.

  10. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Others have pointed at the glaring defficiences in this paper. Where are the calculations of all the resources needed to build out this infrastructure? Will it be possible to build more, or maintain existing, once 100% of the energy use is from renewables? It doesn't mention whether the electrolysis of water can produce enough affordable hydrogen for those transportation needs that it envisages will use hydrogen (though someone else mentioned hydrogen powered aircraft had already been discarded), at the rate required. And how does the adpotion, or not, of this strategy by the rest of the world affect the feasibility or likelihood of it?

    To me, this seems like more wishful thinking to avoid changing our behaviour.

  11. New paper shows that renewables can supply 100% of all energy (not just electricity)

    denisaf @25,

    As pointed out @27, your "reputed researchers over forty years ago" must have grown fat on their own words that they had to eat. Unless you have yourself further words on that subject (and also on the re-use of materials required for solar/wind power given the comment @24), I wish you "bon appetit".

    Your third point, the use of fossil fuel resources for purposes other than that power generation, there is presently much common use of infrastructure etc but I have not heard anybody warning that we would have to keep burning coal, oil or gas if we want to keep manufacturing plastics. So do explain.

  12. One Planet Only Forever at 15:01 PM on 22 August 2015
    New paper shows that renewables can supply 100% of all energy (not just electricity)

    Rob Honeycutt@27,

    bozzza was probably referring to the old proposal to burn hydrogen in airliner engines. Of course the material problems, including hydrogen embrittlement of the fuel lines in a machine that shakes a lot, made that very unlikely to be economical, as is the current inefficient energy requirements for generating the hydrogen. Why would people choose to use that much energy for that purpose?

  13. New paper shows that renewables can supply 100% of all energy (not just electricity)

    denisaf @25...  Well, interestingly, both Boeing and Airbus are currently working on hydrogen fuel cell technology for aviation, with an eye on passenger aircraft.

  14. New paper shows that renewables can supply 100% of all energy (not just electricity)

    @ 19: why does Renewable Energy require any more of a global industrial infrastructure than nuclear or coal?

  15. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Some time ago I sent a post to Professor Jacobson listing a number of unsound technical items in their proposal in Scientific American of November 2009. Some of those issues are covered in the comments here.

    The suggestion that airliners could be powered by hydrogen was thrown out by reputable researchers over forty years ago but it is included in the proposal. another point is that 'renewable' systems (wind or solar) are made of irreplaceable materials so they can only be a tempoary source of a small amount of electricty. another point is that fossil fuels supply other products that WWS cannot supply.

  16. New paper shows that renewables can supply 100% of all energy (not just electricity)

    sunweb@19 said: "the sun and wind are renewable but the devices are not".  Why not?  Are they somehow used up in the producing of power?  People seem to think that once rare earth metals are mined for solar and wind devices that these materials are no longer available once the devices have outrun their useful life.  That's absurd.  On the contrary, there would be a potent financial reason to reclaim these 'already refined' rare materials during decommissioning, rather than dig up ore's and refine them all over again.

    If this is a new 'fossil-funded denial argument', its absurd on its face.  Wind turbine materials can be reclaimed in the same way gas turbine or steam turbine materials are reclaimed.

  17. New paper shows that renewables can supply 100% of all energy (not just electricity)

    @22 PhillippeChantreau

    The model does not include biomass because of the air pollution associated with burning biofuels. The aim of reducing air pollution appears to also be why they are using hydrogen production as a chemical store instead of a methanisation process.

    With regard to enhanced geothermal, currently EGS is falling out of favour because the rapidly decreasing cost of wind and solar is making those sources cheaper than EGS. The weakness of EGS in a large-scale,100% renewable scenario is that its basically a constant power source (similar to nuclear or coal-fired power in current systems). So it can't ramp-up to take advantage of the high-margin periods when generation from wind and solar is low. This reduces its cost-effectiveness.

  18. PhilippeChantreau at 07:02 AM on 22 August 2015
    New paper shows that renewables can supply 100% of all energy (not just electricity)

    I see no biomass in the Jacobson et al analysis, yet there is a potential there that should be ignored. Almost any material can be prepared to be used in a biomass burning furnace, including herbivores waste products. I also think that the share given to geothermal is pessimistic.

    Enhanced geothermal (EGS) should be given more attention. It has low impact, low risk, can function readily as baseload and is not nearly as expensive as nuclear. It looks so good on paper, one has to wonder why we're not pursuing more aggressively. According to the wiki entry, MIT has determined that the US alone has enough potential to power the entire world. It can also use CO2 instead of water, allowing for carbon sequestration. It does cause induced seismicity, but I don't think it's as bad as fracking. It's hard to see why it should represent such a small percentage in the mix as figures in the Jacobson graph.

  19. New paper shows that renewables can supply 100% of all energy (not just electricity)

    IANW01,

    Storage is not glossed over.  Jacobson uses concentrated solar power with storage for most of their storage.  Managemant of hydro power contributes a small amount.  The system is overbuilt so that all power demands are met 100% of the time. 

    Budischak et al. give specific data for the PJM interconnection (around Pennsylvania)  if you are interested in the Northern states.  Detailed studies have found that it is cheaper to overbuild renewables rather than build a lot of storage.  Budischak generated all their power internally, if they install interconnections to nearby grids they will require much less overbuild.  Budischak also did not use any hydro from Canada for backup on dark, windless nights.  They said using Hydro made it too easy to use 100% renewables.

  20. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Sunweb,

    Most other people disagree with you.  If the energy used to manufacture a solar panel comes from other solar panels than the new solar panel will be sustainable.  Current wind and solar generators are built using fossil power with a little renewable in it.  As more renewable power is built the fraction of power used becomes more and more renewable.  The paper described tells how we can build a system so that all power used is from sustainable sources.  Once they are installed, all economic activity will be done using sustainable power.

  21. New paper shows that renewables can supply 100% of all energy (not just electricity)

    I do not think solar or wind energy collecting devices are sustainable, green or renewable.  The reason is that they require a global industrial infrastructure for the manufacturing.  When they must be replaced they will require a similar infrastructure.  When I had to replace the pancake fan in my inverter, it had such a system behind it for manufacturing.  So the sun and wind are renewable but the devices are not.

  22. New paper shows that renewables can supply 100% of all energy (not just electricity)

    It isn't spam if it is the researched truth.  If I rephrase it but still suggest the videos with URLs is it spamming.  It is a challenge to the technofantasy that solar and  wind energy collecting devices are renewable, sustainable and green.  I find the same censoring when it doesn't fit the world view of the moderator.

    (snip)

    Moderator Response:

    [RH] Moderation complaints are also not allowed here. Please refer to the commenting policy.

  23. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Moderator - I don't think installing "renewables"  is sustainable or renewable.  They are extensions of the fossil fuel supply system.  

    (snip)

    All the human-made things in our world have an industrial history. Behind the computer, the T-shirt, the vacuum cleaner is an industrial infrastructure fired by energy (fossil fuels mainly). Each component of our car or refrigerator has an industrial history. Mainly unseen and out of mind, this global industrial infrastructure touches every aspect of our lives. It pervades our daily living from the articles it produces, to its effect on the economy and employment, as well as its effects on the environment.

    Solar and wind energy collecting devices also have an industrial history. It is important to understand the industrial infrastructure and the environmental results for the components of the solar energy collecting devices so we don’t designate them with false labels such as green, renewable or sustainable. This is an essay challenging ‘business as usual’. If we teach people that these solar devices are the future of energy without teaching the whole system, we mislead, misinform and create false hopes and beliefs.

    I have provided both charts and videos for the solar cells, modules, aluminum from ore, aluminum from recycling, aluminum extrusion, inverters, batteries and copper. Please note each piece of machinery you see in each of the videos has its own industrial interconnection and history. http://sunweber.blogspot.com/2015/04/solar-devices-industrial-infrastructure.html

    Moderator Response:

    [RH] Reposting a canned comment that was previously snipped for sloganeering is not acceptable.

    Please note that posting comments here at SkS is a privilege, not a right.  This privilege can be rescinded if the posting individual treats adherence to the Comments Policy as optional, rather than the mandatory condition of participating in this online forum.

    Please take the time to review the policy and ensure future comments are in full compliance with it.  Thanks for your understanding and compliance in this matter.

  24. New paper shows that renewables can supply 100% of all energy (not just electricity)

    keithpickering - I don't see anything in the Jacobson et al paper making claims against nuclear based on water usage - do you have a reference for that?

    The Decarbonization document seems interesting on a quick look, but I can't agree with some of their base numbers. They assume 2,500GW of renewables (wind/solar) to match 400GW of nuclear, a factor of 6X, whereas Archer 2007 demonstrated that a mere 19 distributed and interconnected wind plants could maintain a reliable baseload power of 33% their average (47% the yearly average), a factor of perhaps 3X, half of what they sate, simply because the same weather pattern wouldn't cover (and potentially nullify) all of the wind farms at once. 

    Archet et al also discussed techniques for reducing transmission costs by ~20%, with regional concentrators for the wind power and interconnecting to the larger grid from there. But the major impact IMO is in understanding baseload capabilities. 

  25. New paper shows that renewables can supply 100% of all energy (not just electricity)

    sunweb @12.

    It is a lot of wind turbines being discussed but they have to be judged against the alternatives. This erecting of 600-odd turbines a day would yield the same generation capacity as having to build every fourth day one very very large multi-steam-plant coal power-station. You may feel the 2,400 turbines in 4 days is a bigger ask than on giant coal power-station but perhaps you have less understanding of how big such power-stations actually are.

    As a comparison, the daily 600 turbines will contain something like 300,000 tons of material. That's 300,000 tons per day for 18 years.

    That's a lot of material but of the same order as the daily materials required to build a giant power-station every 4 days. This web page shows a relatively small power-station (40% the size I'm working to) using 900,000 tons of concrete & 56,000 tons of steel.

    And those 1,600 coal power-stations built over the 18 years would still need feeding with coal, a combined total of 55,000,000 tons of the stuff, day in, day out until they can be replaced by a better technology. So is it worth discussing this coal solution being green, sustainable or renewable? I think not.

  26. New paper shows that renewables can supply 100% of all energy (not just electricity)

    A very interesting, and dare I say, optimistic paper. However, while filled with lots of numbers, it seems to gloss over the storage and long distance transmission required during calm winter evenings in the northern states. And if this is the path forward it's time to buy stocks in copper and rare earth element producers.

  27. One Planet Only Forever at 02:43 AM on 22 August 2015
    World Bank rejects energy industry notion that coal can cure poverty

    PhillippeChantreau,

    I totally agree and would add that not long ago the World Bank would have been full of people that would help promote the interests of the likes of the coal barons any way they could get away with.

    Many changes for the better are happening.

    Even the current global correction of the markets (drops in stock market values) could be a good change if they are a reduction of unjustfied perceptions of value of activities (pursuits of profit) that are associated with or rely on the extraction and burning of fossil fuels (more than just coal).

  28. New paper shows that renewables can supply 100% of all energy (not just electricity)

    I really found this article interesting.

     

    Since wind turbines and solar panels use so many rare earth elements can we expect that future technologies will overcome the huge environmental impacts of mining them?  I know the mining of them in the US is prohibided.  From what I've also read, China may not be as forthcomming with them in the future.  

  29. New paper shows that renewables can supply 100% of all energy (not just electricity)

    One of the proposals of this ilk was by Jacobson. Jacobson’s first paper proposed: Starting in 2012 for 50% of the world’s energy we would need: 2111112 machines a year for 18 years which is over 578 machines a day for 18 years which is over 24 each hour, each day, 7 days a week for 18 years http://spectrum.ieee.org/energy/renewables/wind-water-and-solar-power-for-the-world/0 and http://www.scientificamerican.com/article.cfm?id=a-path-to-sustainable-energy-by-2030 In an email discussion with the second author he proposed that since we do it with cars; we can do it with “renewables”. So all the mining, processing, manufacturing, transporting, installing, two or three times a year maintenance. This is green? This is sustainable? This is renewable?

    Moderator Response:

    [RH] You seem to be making a very strange statement that installing renewables is not sustainable or renewable.

  30. New paper shows that renewables can supply 100% of all energy (not just electricity)

    All the human-made things in our world have an industrial history. Behind the computer, the T-shirt, the vacuum cleaner is an industrial infrastructure fired by energy (fossil fuels mainly). Each component of our car or refrigerator has an industrial history. Mainly unseen and out of mind, this global industrial infrastructure touches every aspect of our lives. It pervades our daily living from the articles it produces, to its effect on the economy and employment, as well as its effects on the environment. Solar and wind energy collecting devices also have an industrial history. It is important to understand the industrial infrastructure and the environmental results for the components of the solar energy collecting devices so we don’t designate them with false labels such as green, renewable or sustainable. This is an essay challenging ‘business as usual’. If we teach people that these solar devices are the future of energy without teaching the whole system, we mislead, misinform and create false hopes and beliefs. I have provided both charts and videos for the solar cells, modules, aluminum from ore, aluminum from recycling, aluminum extrusion, inverters, batteries and copper. Please note each piece of machinery you see in each of the videos has its own industrial interconnection and history. http://sunweber.blogspot.com/2015/04/solar-devices-industrial-infrastructure.html

    Moderator Response:

    [RH] I've deleted the contents of this comment because the exact same comment is copied and pasted repeatedly around the internet. This would constitute spamming. Please review the SkS commenting policies before posting again.

  31. PhilippeChantreau at 01:29 AM on 22 August 2015
    World Bank rejects energy industry notion that coal can cure poverty

    This is really making a short story long. Coal has not cured "energy poverty" in 200 years, ans there is no indication that the people who have got rich from coal in the past and are getting rich from coal now have any intention to significantly change their business model so that their focus will be on curing anmything. Not much else to say.

    Now, of course, whether or not "energy poverty" is something that can be "cured" is another debate entirely. The reality of the whole concept would have to assessed first. I lived once in a country blessed with both oil and uranium, and some of the people there could have been described as living in "energy poverty." I guess some of the more educated may even have used the word "energy clolonialism" but in a very different way than is mentioned in the OP...  

  32. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Certainaly "renewables" could power us but there is no way to get there from here without destroying the biosphere in the process. A shift of that magnatude would require massive fossil fuel burning, mining, processing, cement, and every other industrial process that is killing us and that would be in addition to all of the industrial processes that we now have happening continuing to function in order to not collapse the global economy.

    (snip)

    We are at a point in human evolution where every solution to a problem creates an even bigger problem that we will need to solve for later.

    So what do we do? LESS!!!!!!

    Moderator Response:

    [RH] Sloganeering snipped. If you're going to make such extreme statements you're going to have to back them with some actual data and figures.

  33. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Nuclear is nowhere close to 33-40% efficiency .... In fact it's not even double digits

    Only 5% of the potential energy in a nuclear fuel rod is used while the other 95% goes to waste making Nuclear Waste waste on more than one level. Then you add the inefficiencies in the mining process, inefficiencies in the refining process, ineffeciencies in the steam boiler and finally the inefficiencies of the turbine generator itself you'd be lucky to hit a 1% efficiency when PROPERLY CALCULATED 

  34. New paper shows that renewables can supply 100% of all energy (not just electricity)

    keithpickering, actually from my reading they say that nuclear was excluded because of cost factors and construction time. I didn't see anything about water use of nuclear power... let alone that this was the reason for excluding it.

  35. keithpickering at 16:27 PM on 21 August 2015
    New paper shows that renewables can supply 100% of all energy (not just electricity)

    As usual, Jacobson et al. miss the boat by excluding nuclear power from their analyses on the thinnest of excuses. (Water use is the excuse, even though hydropower uses vastly more water than nuclear yet somehow manages to make the cut. In other words, Jacobsen et al. are playing politics instead of science.) 

    Meanwhile, the Deep Decarbonization Pathways Project found that the high-renewables scenario, similar to the plan Jacobson et al. favor, would cost about four times more than the cheapest pathway, which happens to be the high-nuclear pathway. (That's strongly dependent on the future price of fossil fuels, but taking the median in each case.)

    It will be interesting to see how the upcoming paper on grid revamping will turn out. The most recent HVDC line in North America, the West Alberta line (opened last March) cost $6 million per mile for a 1 GW line, and that's through relatively unpopulated country where rights-of-way are cheap. At that price, it's cheaper to build a nuclear plant next door that it is to transmit wind power 700 miles.

  36. New paper shows that renewables can supply 100% of all energy (not just electricity)

    @ villabolo .  re efficiency improvements. Note in the graph that there is a planned reduction in energy consumed of about 33% from todays levels (2.4 TW down to 1.59 TW), or more than 1TW from predicted business as usual levels (in 2050). Most of that saving is from switching to electricity, but some from efficiency improvements.

  37. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Knaugle,

    Jacobson et al. "do the math" in their paper.  As described in the second pargraph of the OP, approximately 1.6% of land area would have wind generators widely spread out.  Farming or other land uses would take place between the generators (the actual land footprint of the turbines is small).  If you put the generators in the most efficient places it would take less generators but that is not quantitated (it would also cost less).   You could put more wind generators at sea and reduce the onshore wind even more if that is desirable (offshore is more expensive but the wind is more consistant).  

    Your quote of 25% capacity for wind is too low.  Your argument is inconsistent since you used the maximum output for nuclear and the minimum for wind.  You need to use comparable estimates for both if you want to make a fair evaluation.

  38. New paper shows that renewables can supply 100% of all energy (not just electricity)

    @ scaddenp #3.

    Yes, I should have thought of my answer more carefully. My goal, however, would be for an 80% reduction in fossil fuel energy use within the next 20 years (I know, I'm dreaming).

  39. New paper shows that renewables can supply 100% of all energy (not just electricity)

    That 16% needs to be seen in context of what proportion of total energy consumption is in residential home use. In NZ, it is about 10% of energy use though I expect it to be higher in places with more heating/cooling needs and/or less transport costs.

  40. New paper shows that renewables can supply 100% of all energy (not just electricity)

    I'm assuming that this paper assumes current electrical uses projected into the future. However there are off grid communities in existence that consume 16% of the electricity normally used in the general area.

    This ecovillage has all the anemities and appliances of a middle class house with homes that are conventional looking (no "earthships"). 10 inch super insulated walls, led lighting, underground heating and cooling tubes and passive solar design make this dramatic reduction possible.

    With such a massive reduction in electrical and energy usage we'll only need one sixth of our current energy usage for homes. 50 mpg hybrid cars will take care of the rest.

  41. New paper shows that renewables can supply 100% of all energy (not just electricity)

    Still if you do the math, it takes about 1800 Wind turbines rated at 2.5 MWe (capacity factor about 25%) to replace a single 1100 MWe baseload plant (capacity factor >90%).  That's a lot of land coverage.  That means there are still some significant practical hurdles to get to where this paper suggests.  It is not entirely a political problem.  Solar, hydro-electric and others all have their issues as well.

  42. Christopher Gyles at 03:14 AM on 21 August 2015
    Corrected sunspot history suggests climate change not due to natural solar trends
    Is this as significant a correction as it appears to my inexpert understanding?
  43. Corrected sunspot history suggests climate change not due to natural solar trends

    Interesting topic. I read their study a few weeks ago.

    You might call it "The Making of Sunspots 2" but they called it..

    "Revisiting the Sunspot Number"
    Frédéric Clette, Leif Svalgaard, José M. Vaquero, Edward W. Cliver

    arxiv.org/abs/1407.3231 with downloadable .pdf

  44. Corrected sunspot history suggests climate change not due to natural solar trends

    Since this revision affects the solar input parameters to most climate models, there will need to also be some rework of those?   This is good science.    One can expect it to be misinterpreted in the usual places :-)

  45. 2015 global temperatures are right in line with climate model predictions

    Sou, dont forget our friend John Kehr, aka TheInconvenientSkeptic, probably ASOFAI-fan, who thinks Milankovitch forcings somehow beat all other numbers.

  46. Miriam O'Brien (Sou) at 12:11 PM on 19 August 2015
    2015 global temperatures are right in line with climate model predictions

    Like Jos, a couple of years ago I put together some unusual and "couldn't be more wrong" alarmist predictions from deniers:

    http://blog.hotwhopper.com/2013/07/denier-weirdness-collection-of-alarmist.html

    While within the model envelope, I think that in a strong El Nino year, the surface temperature would be expected to rise above the line. As I understand it, the reason it doesn't is because the forcing estimates were on the low side (eg volcanic aerosols), as well as the PDO being in its cold phase till recently. The next few years will tell more of the story.

  47. 2015 SkS Weekly Digest #33

    "El Niño Could Rank Among Strongest on Record"
    Soon to be heard.. "Warming stopped in 2015" Sigh.

  48. 2015 SkS Weekly Digest #33

    Coming Soon section was not updated.  Looking forward to another great week of stuff!  Thanks and keep up the good work.

    Moderator Response:

    [JH] We are working to correct this section.

  49. Earth Overshoot Day

    There is one physical property of CO2 that is not talked about and that is its weight.

    It weights more that air and sinks in air that's why 3 ski patrollers died at Mammoth,CA and in Yellowstone animals are killed there because the CO2 is heavier that air.

    In fact, nature O2/CO2 cycle is built around this property. The green leaves, at ground level (where CO2 sinks to), take in CO2 and produce O2. Think of it differently_____NO CO2-------NO O2!

    I'm not saying we are not the cause, but I think in another way.

    Carbon is the cause, yes. Fine particles of carbon can float in air. That is the cause of many a coal mine explosion. So CO2 sinks in air but C can float in air if the particle size is right.

    And what would produce CO2 in the upper atmosphere? Since CO2 can not float up to there!

    Highly reactive ozone O3 (produced by UV from the sun) and carbon particles, C+O3 = CO2+O, and then the CO2 sinks down. They also say there is an ozone depletion problem allowing more UV in!

    John S Goldner

    Moderator Response:

    [PS] Offtopic. Please immediately familiarize yourself with the  Comments Policy. Conformance is not optional. Ensure future comments are in full compliance with it.  Thanks for your understanding and compliance in this matter.

    And you might want to familiarize yourself with the science and observations of gas distributions in the atmosphere once a gas has been become mixed.

  50. Earth Overshoot Day

    The real Debt and Deficit Disaster.

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