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MA Rodger at 02:21 AM on 23 May 2018Trenberth can't account for the lack of warming
ab @41,
Your sixth paragraph needs correcting. This hypotheitcal body does not recieve 890Wm^-2. It recieves 860W. It has a top surface (area 1 sq m) recieving 494Wm^-2=496W. It has a bottom surface (area 1 sq m) recieving 396W^m-2=393W. The body is thus recieving 494W+396W=860W. It has a total surface area (top+bottom) of 2 sq m so will need to radiate 445Wm^-2 to be in equilibrium. You do manage to present this 445Wm^-2 value in your seventh paragraph but the erroneous 860Wm^-2 rears its head in the ninth paragraph even though there was never a flux of 860Wm^-2, only a total (up + down) flux of 860W acting on a body with a surface area of 2 sqm.
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ab at 01:41 AM on 23 May 2018Trenberth can't account for the lack of warming
MA Rodger @ 40,
Of course, I was implicitely supposing a blackbody of one square meter: a flat rectangular blackbody plane of 1m² as you pointed out.
Let's say a plane that is floating 1 meter above the earth's surface, one face pointing to the sky and the other pointing to the ground, and let's give it a name: "thermometer".
So this blackbody "thermometer" is going to receive from the sky as much as 1m² of earth's surface, as 1meter above the ground is negligible here to make any difference.
And because heat is transmitted within the ground by conduction, this blackbody "thermometer" will also receive as much from the ground than what is indicated into the IPCC diagram, as any difference would be negligible for 1m².
So, the thermometer will receive on its top 161 W m-² from the sun and 333 W m-² from the atmosphere backradiation, and on its bottom 396 W m-² from the ground.
That is, it receives 496W m-² from the top and 396 W m-² from the bottom, that is, in total, it receives 890 W m-².
As it is a blackbody, in thermal equilibrium, it is also going to emit as much as it receives, that is, also 890 W m-², in equal quantity at the top and the bottom: 445 W m-².
Now, the thermal equilibrium of that blackbody thermometer is based on its total energy, right ? It is not based on just the top or the bottom, it is based on the total energy it receives which is also equal to the total energy it emits.
And that total energy is 890 W m-², from which we can infer the temperature of the blackbody thermometer in thermal equilibrium: 80,8°C, according to the according to the Stefan-Boltzmann Law.
That is: a 66°C difference from the model compared to the measured temperature on Earth's surface (15°C), and not just a 10°C difference like you concluded in @40, which is already a considerable difference !
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MA Rodger at 01:10 AM on 23 May 2018Trenberth can't account for the lack of warming
ab @39,
And what is the surface area of this body?
Let is keep it simple and say it it has no side area being a flat plate 1m x 1m. What is the surface area of such a body? Remember it will be radiating from the entire area. Being flat we can ignore the sides. Its top being warmed by the 494W sun+atmosphere is 1m x 1m = 1 sq m. Its bottom being warmed by the 396W surface flux is 1m x 1m = 1 sq m. Total surface area = 1 + 1 = 2 sq m. And this is the area being radiated from due to the body's temperature. So the body has to shed (494+396)/2=890W/2=445W/m^-2. So without any sensible heat loss, its blackbody temperature would be +24°C not +81°C.
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ab at 00:19 AM on 23 May 2018Trenberth can't account for the lack of warming
MA Rodger @ 38,
Yes, I'm taking the data from Trenberth's energy diagram which is quoted by the IPCC in their reports.
Let's forget a moment about the ISS, and just consider a physical black body on Earth's surface, whatever it is.
As I pointed out in @37, according to the IPCC diagram, any physical body on the surface of the Earth is, on average, subject to 161 W m-² coming from the sun, 396 W m-² coming from the ground and 333 W m-² coming from the atmosphere backradiation, that is, at least 890 W m-² without taking into account secondary heat sources from the diagram.
So, according to Stefan-Boltzmann Law, such radiation as absorbed by a black body would rise its temperature to 81°C... However, the mean temperature on Earth's surface is 15°C, not 81°C...
There is a 66°C difference between the model and the measured temperature at the surface of Earth, and as pointed out by Trenberth, we can't account for the lack of observed warming compared to the modeled radiative flow on the surface.
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MA Rodger at 22:49 PM on 22 May 2018Trenberth can't account for the lack of warming
ab @36,
Your final three paragaphs are predicated on the assumption that you present a valid assessment in your second paragraph, but you do not.
From the various numbers you are using, it is plain that you are using the data presented this diagram to calculate your 987Wm^-2. The error you make in calculating that 987Wm^-2 is that half the quantity is downward radiation and (most of) the rest is upward radiation. Such energy fluxes cannot heat the same surface. So, just as is required in converting the solar TOA energy flux (from a 'plain' value of 1,366Wm^-2 warming the disc of the Earth into an 'areal' value of 341Wm^-2 warming the globe), we have to convert the energy flux warming the earth-parked International Space Station into upward and downward. You need to divide by 2.
In more detail, the surface latent heat transfer is unlikely to be warming the ISS (or its own latent heat transfer cooling the ISS) while we should perhaps expect the sensible heat loss to be, like the radiative fluxes, from both upper and lower surfaces. The resultant equilibrium temperature would this be a tad lower than the surface.
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ab at 22:26 PM on 22 May 2018Trenberth can't account for the lack of warming
@ scaddenp (35), it is not what Trenberth is saying: for him climate science violates physics, and that's why he said that "we can't account for the lack of warming"...
Indeed, if you calculate the emitted IR from the ground by the Stefan-Boltzmann Law as pointed out by MA Rodger in @34, for 1m², 14°C and a black body of emissivity 1, you'll find a radiative power of 385,5 W m-², approximatively equal to the one of the Earth's Energy Budget for IR emitted by the ground only (396 W m-²).
But according to the same Energy Budget, any body on the earth surface is subjected to 161 W m-² from the sun, 396 W m-² from the ground and 333 W m-² from the atmosphere backradiation, that is, at least 890 W m-² without taking into account heat from thermals, evapotranspiration and latent heat.
So according to the energy budget, the mean temperature should be, for a total radiation of 890 W m-², approximatively 81°C according to the Stefan-Boltzmann Law ...
Moderator Response:[DB] Sloganeering, falsehoods and evidenceless assertions snipped.
FYI, I have corresponded personally with Dr. Trenberth and the words you put into his mouth are indeed falsehoods you made up.Last warning to adhere to this venues Comments Policy. No more shall be given.
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ab at 19:51 PM on 22 May 2018Trenberth can't account for the lack of warming
Thanks MA Rodgers, your answer is very helpful.
So the answer is that the ISS, approximated as a rectangular plane, receives 1366 W m-² from the sun when facing the sun, while on average, Earth's system, approximated as a sphere, receives only 341 W m-² from the sun.
But then, how do you explain that 1366 W m-² received from the sun by the ISS rise the temperature to 121°C, while an average of 987 W m-² on the surface gives a mean temperature of 10-14°C on Earth, which would be the temperature of the ISS on the ground, right ?
So, it suggests that more than 100°C degrees of difference between the ISS and Earth's surface is caused by a difference of only 399 W m-² of radiation (1366 - 987), that is, the same amount of radiation than emitted IR radiations from the ground ( 396 W m-² )...
If only 400 W m-² would lead to an increase of 100°C on Earth, what would be the powerful cooling mechanism which doesn't appear into the Earth's Energy Budget ?
And also, by what processes or how does radiation build up and accumulate into the atmosphere in such a way that there is as much backradiated radiation (333 W m-²) than emitted ground radiation ( 396 W m-² ), than incoming solar radiation (341 W m-²) ?
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nigelj at 17:58 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Art Vandealy " I would add too that buying an EV before your existing vehicle needs to be replaced is also an exercise in emissions creation."
No, because the lifetime emissions of electric vehicles are lower (the short answer). But I agree it makes sense in terms of emissions in manufacturing to keep appliances as long as possible, and especially don't just throw them out if they still work.
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ubrew12 at 16:46 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Vandelay@23 said: "I'm personally incined to wait until EV's are a little further evolved" The planet is also 'evolving' while you wait. Yes, the figure I saw is that half of the CO2 developed by a gasoline-powered vehicle was developed turning oil into gasoline, before the fuel ever got to the car. When Lesser asks us to compare electric with modern gas-powered vehicles (full disclosure: I own a Prius), he is talking just about the vehicle, and not the fuel.
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Art Vandelay at 15:30 PM on 22 May 20182018 SkS Weekly Climate Change & Global Warming News Roundup #20
nigelj@1, yes good point. Biodiversity loss was already proceeding at a massive rate before climate change came along.
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Evan at 15:22 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Art@25
We never sold a vehicle until trading in the truck for our EV. We always drove them into the ground. But I figure that there is a demand for trucks, and if I sell mine then theoretically one less will be manufactured, because there is a certain level of demand. Had we parked the truck and then bought the EV I would agree with you. But I also readily admit that somewhere there might be a flaw in my thinking. I honestly believed it was the right move.
But to be perfectly blunt, it became impossible for me to study and write about climate change and continue to drive our truck. We still have an IC vehicle as our second vehicle, and it mostly sits. For that vehicle I agree with you, because for the small amount we drive it it would be a waste to replace it with an EV.
A year from now I might agree with you, but it seemed like the right move. Especially considering we burn tar-sands oil in Minnesota.
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Art Vandelay at 15:15 PM on 22 May 20182018 SkS Weekly Climate Change & Global Warming Digest #20
It's pleasing to see public attention to this important issue, particularly here in Australia, because gov'ts are doing almost nothing, and to make matters worse, 'green' groups are opposed to most water management solution projects, apart from expensive coastal desalination plants that emit co2 and don't address the looming inland water crisis.
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Art Vandelay at 15:03 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Evan@24, I would add too that buying an EV before your existing vehicle needs to be replaced is also an exercise in emissions creation. The answer is to consume less, which mostly means that we should wait until our electronics and household consumables need to be replaced before we actually replace them. Governments are best placed to take the lead on EV's, which means making them mandatory in the gov't sector.
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Evan at 14:46 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
What is missing in so much of the discussion and what Kevin Anderson brings home is that we are out of time. The real question is whether we can stabilize at 2C or whether we will slowly lose control to feedbacks. We cannot wait for perfect answers. We must take the best we have and cut down however we can.
As I write this I know that I am a hypocrite, and although I am trying to cut back, I need others on the outside to remind me that I need to continue to cut back. This is part of the value of people like Kevin Anderson. They are out there telling us directly that we are out of time and that we must act now. EVs are not perfect and hopefully their carbon footprint will be lower in the future. But an EV is likely much lower carbon than the truck we traded in to buy the EV.
We must take steps in the right direction. And then take additional steps.
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Art Vandelay at 14:31 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
ubrew12@2, Are you referring to the emissions cost of refining crude oil into petroleum? I suppose you could go a step further and add the cost of mining and exploration etc, but it should also be said that EV's themselves incur significant emissions costs during manufacture, and then there's the new problem of battery waste and recycling. Pointing to this article also from the Guardian - www.theguardian.com/sustainable-business/2017/aug/10/electric-cars-big-battery-waste-problem-lithium-recycling. Given that future battery tech will likely be "super capacitor" and not a chemical storage cell, and will thus overcome charge cycle limitations as well as environmental impacts, I'm personally incined to wait until EV's are a little further evolved
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scaddenp at 14:26 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
What is missing the numbers. However, I see from his publications more about meeting the 2 degree challenge which should contain the detail. I am not all convinced that we will build renewables more slowly. With costs dropping on wind and solar, I would say the reverse.
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nigelj at 14:10 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
I think we could quite rapidly and completely convert to renewable electricty and possibly resolve the other issues in just a couple of years, if we really, really wanted. Most analysis puts the cost of converting Americas fossil fuel electricity grid to renewables at about 4 trillion dollars total, and America spent about 8 trillion dollars in 1945 alone on the war effort in todays money (40% of annual gdp, so almost half their economy was devoted to the war effort!).
But it would be very harsh, requiring huge cuts in spending elsewhere, and politically unlikely, because theres not that sense of desire for sacrifice, especially over such a short time frame, or the sense of urgency like the war.
Anderson is probably right. We will build renewable energy more slowly over 20 years at best, so Anderson is also right we also need to reduce personal consumption. In fact theres are many reasons to cut our levels of personal consumption of both energy and raw materials. There's a sort of confluence of reasons, all well known to anyone interested in the environment and economic issues.
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Evan at 13:27 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
scaddenp@18
I respect that agricultural emissions are really tough. Currently there are about 5 people per cow in the world. That seems like a lot of milk and steaks! Learning about the methane emissions from cows helped me go vegetarian.
I am impressed that in NZ 80% of your power is renewable. Obviously we in the US have a lot of catching up to do.
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Evan at 13:15 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
scaddenp@17
Here is a quote from Kevin Anderson when he was being interviewed by Democracy Now in November 2013, and here is the link. He says the same thing in most of his talks, such as this one here. I've heard both sides, and to me Kevin sounds much more realistic, accounting for the way things really work. I hope Kevin is wrong, but I think we should act assuming he is correct.
KEVIN ANDERSON: In the short term, the only way we can get our emissions down is to actually reduce the level of energy we consume. Now, we can also put low-carbon energy supply in place, you know, power stations that are renewable—wind, even nuclear, as well. These are all very low-carbon power stations and other energy sources. But they take a long time to put in place. And we now—we’ve squandered the opportunity we had to make those changes. So, we still need to do that, but it’s going to take us 20, 30 years to do that. So what we need to do in the interim is to reduce the amount of energy we consume, and therefore reduce the amount of carbon dioxide that we emit.
And the levels of reduction we now need in carbon dioxide, and therefore energy consumption, are such that for many of us—for the wealthy of us, certainly—we can’t carry on as we’re going now. So we’ll have to consume less. And there’s absolutely no way out of that. The maths are absolutely clear.
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scaddenp at 12:30 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Also Evan, for us in NZ, our electricity is 80% renewable already. 50% of our emissions roughly are agricultural (milk powder to large degree). A meaningful reduction in our carbon emissions isnt easy. Flying and reducing the amount of stuff (embodied energy) we consume are the main personal pathways.
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scaddenp at 12:26 PM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
can you give a link for Kevin Anderson's analysis? Others contradict that. There are several ways to get those numbers very wrong. (eg looking a primary energy production).
For much of world, cars are only part of the problem. Getting off coal generation is single most important step. If you cant put up solar panels (live in an apartment) and cant choose a supplier of green energy, then you have limited options for getting off coal. I dont think you can get around the important role government has here.
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Evan at 11:52 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Let's agree on the following. If everyone committed to reducing their carbon footprint 10%/year, however they did it, we would quickly start moving towards a solution. Even a person driving a Hummer could reduce their carbon footprint if they simply drove their Hummer less each year.
The reality is that it takes a long time to transition from our current way of doing things to a sustainable way of doing things. EVs are part, but not all of the solution.
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Evan at 11:37 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
jef@13 and 14
We get to choose between more than 2 candidates. Remember there are primary elections where it all starts.
I agree that the answer is not equipping all 7 billion with private electric cars. That is why I refer to Kevin Anderson's message about cutting back. Our going to an electric car does reduce carbon emissions, but in the long run we need to cut down on ownership to reduce emissions even more. It takes a while to revamp society and to modify our lifestyles. Right now EVs are better than ICs given the constraints we have of dismal public transportation in the US.
It will take time to transition to low-carbon transportation. EV cars are a step, but a much better solution will be EV public transportation, or shared EV vehicles. The solution is certainly not continuing to burn fossil-fuels in IC cars. This we know, because it is impossible to apply carbon capture and storage at the personal vehicle level.
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jef12506 at 11:04 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
The EV vs IC choice is as reasonable or I should say as unreasonable as choosing between shooting or stabing. The assumption is that there is no choice other than everyone of us 7+ billion eventually getting his or her own car, anything less is economic repression and unfair. This is the crux of the problem not electric vs gas.
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jef12506 at 10:59 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Evan - your logic is selective. We don't get to choose who we vote for, we get to choose between two people who WE had nothing to do with selecting. If I ask you you have a choice of me shooting you or me stabing you are you the one choosing to die?
Also all of the FBI,CIA BS in the news is about how the DNC and Clinton got rid of the hands down #1 choice of the American public, Sanders!
If we were to ramp up EV production to replace the current IC auto inventory it would be an environmental catastrophy.
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Evan at 10:23 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
I like Kevin Anderson's message that we won't solve the climate problem by subsituting fussil-fuels with renewable energy. According to Kevin Anderson, there simply is not enough time to bring renewable energy online to meet current energy consumption. We need to cut back. And that will be difficult.
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nigelj at 10:08 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Yes government has a significant part to play in resolving the climate problem, and it does indeed start with renewable energy. Ordinary people cant do much about that, and companies won't move to adopt renewable energy unless theres some level of subsidy or regulation pushing them. However history has shown it doesn't need much, for example the UK, so the ideological objections seem like nit picking to me.
Individuals can cut their carbon footprint and buy electric cars etc. It's challenging, as it requires change, and a less materlastic lifestyle and traditionally materialism has come to define status in western countries. Perhaps humanity just simply has to learn new ways of defining personal success and identity. And at least electric cars are pretty cool (or getting that way) and perform remarkably well.
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Evan at 09:58 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
But then there was Bernie Sanders. I am not endorsing him, just noting that he ran a pretty successful campaign with little funding.
And then there is Tesla. Wildly successful, and no advertizing.
Social media has a powerful effect these days.
Bernie and Tesla have been successful going against modern norms. To turn the climate problem around, we must learn to energize individuals, even if at the same time we rely on big organizations.
There is no simple answer, but there are lots of clues around us about how to circumvent the current political environment.
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nigelj at 09:48 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Evan @7, yes some of those politicians who have let lobby groups influence them too much will not be elected again, but they will just be replaced with politicians subject to the same lobby group pressures, in a sort of merry go around. No doubt politicans largely start with the best of intentions, but the pressure will be there.
Politicians are reliant on lobby groups for campaign financing and the fossil fuels sector is wealthy for example, and its obviously in their interests to gain influence and so politicians are somewhat captive to what donors want, even if it's subtle pressure, and they arent consciously aware of it. The proof is obvious in the way politicians ignore overwhelming majority views, and what appears to even be their own beliefs at times.
This can all be reduced by limits on campaign financing as some other countries have, or better still tax payer funded election campaigns. But in Amerca this is regarded as "unconstitutional" which begs the question of whether the constitution really makes sense.
I think lobby groups do indeed influence voters, but this is a separate problem. Its a tough issue as I support free speech, but we could do so much more to allow the public to make informed decisions if we taught much more rigorous skills on logic and identifying misleading rhetoric at school. Of course the lobby groups would probably lobby against that. Sometimes the behind the scences lobbying has leaked into our media and it's really insidious what goes on, and more than people realise, and I hope you don't underestimate it.
I would go so far as to say modern politics has become defined by lobbying, and in this large corporates are obviously disproportionately powerful in influence and hard to counter. That's not to say their views should not be genuinely considered of course, its a question of how the system works.
I agree with the rest of what you say. We can raise awareness about the climate issue. Every bit helps.
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scaddenp at 09:43 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
I think most people, most places, vote for their party of identity. If the candidate really doesnt appeal, then more likely to not vote than to vote for the opposition. The US electoral system also seems to be more focussed on local issues than national issues compared to ours (NZ).
Money spent on PR is to convince voters that what is good for the wealthy lobbiests is good for the voters. This PR is often successful. The whole existance of lobbiests ( people talking to representatives rather than to voters) smacks of broken system to me.
I also think that many of the problems are so big, and so many dont care, than you will not solve the climate problem without some government help even if only at local level. The real guts of it is about using non-FF energy sources. For a lot, there is no choice. Non-FF has to be cheaper than FF. We also need tech not yet invented (like better batteries) and that takes investment.
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Evan at 08:54 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
nigelj@6
No amount of campaign funding will elect a candidate that nobody votes for. Once elected, those who go against the voters and side with lobby groups will not be re-elected. At least this is the way it should work if people vote in line with what matters to them, but clearly you are correct in that the lobby groups have been effective in telling people what they should care about.
Are climate issues at the top of the list for a majority of voters? I think not (peronsal opinion), because otherwise it is difficult to see how the current crop of politicians were elected. SkS is trying to move climate issues higher up on the priority list of voters.
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nigelj at 08:36 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Evan @5, would it be much different with a democratic president and congress? I would suggest only to a limited degree. The influence of lobby groups on them is still huge, and thats where they get a lot of campaign funding. It seems like a systemic problem that is very strong in America.
But yes, a lot of this is about personal initiative.
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Evan at 07:45 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
nigelj @4
There seems to be a big disconnect between what polls and elections indicate. Nobody forced anybody in the US to vote for the current batch of politicians. We chose them, and the current president was blatantly obvious about what he stood for during the past election. In a country with as many personal freedoms as Americans enjoy, there is not much excuse for inaction. We must stop waiting for people above us to act in our best interest. There is no way out of the climate problem without personal initiative, and in the US we still have the freedom to act.
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nigelj at 07:16 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Fred Singer is a conservative leaning ideologue with strong ties to corporations and right wing think tanks. He is far from impartial and disspassionate.
America has effectively become a dictatorship, or oligarchy, ruled by politicians linked to lobby groups, corporate interests, and crank scientists like Singer, who regulary ignore the will of the majority. Most Americans want renewable electricity, fuel efficient cars, and better gun control according to polls by Pew Research etc, but are being ignored. The scale of this is breathtaking. Article on attempts to overturn Obamas fuel efficient car legislation.
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scaddenp at 07:04 AM on 22 May 2018Trenberth can't account for the lack of warming
ab, assuming experienced physicists have got it all wrong because you dont understand it takes some hubris. Physics is not a smorgasbord. You cant pick and choose which bits you want. Before you can declare that observations show current physics has it wrong, you need to settle down with serious textbook and learn what the actual theory this. Sounds to me like you are spending too much time with ilk of PSI and not enough time with a real textbook. Nothing in climate science violates physics. If you think it does, then the problem is with your understanding not the science.
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MA Rodger at 03:55 AM on 22 May 2018Trenberth can't account for the lack of warming
ab @33,
Trenberth would have little difficulty answering. The answer is simply physics.
The 121°C temperature derives from the Stefan-Boltzmann Law which defines how much energy a hot surface will radiate. To be in balance with continuous sunlight (1,366Wm^-2), a surface normal to the sunlight incidence with emissivity=1 and zero-reflection would be in equilibrium with a temperature equal to 121°C.
The Earth, of course is only illuminated by the sun during the day and that is normal (directly overhead) only at noon. The result is an average level of sunlight reaching the Earth being 25% the constant normal solar level. That would result in an equilibrium temperature of about +5°C, except about a third of sunlight is reflected back into space so the global solar warming averages one sixth the constant normal level requiring an equilibrium temperature of -18°C. But the surface is warmed not just by the sun but also by the atmosphere. The average surface temperature therefore will be hotter than that value. With the Earth's GHGs the surface temperature is +14°C. And being hotter, it will on average radiate more than a surface warmed solely by the sun, even without any reflection.
I think that answers both your questions. The answer is 'physics'.
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Evan at 03:43 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
ubrew12@2
To emphasize your point, a big reason we bought an EV is that apparently most of the Minnesota gasoline comes from the Canada, which I assume means tar sands oil. So it's not just the at-the-pump savings, but everything before that as well.
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ubrew12 at 03:30 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
Jonathan Lesser: "electric vehicle proponents... fail to consider just how... efficient new internal combustion vehicles are. The appropriate comparison for evaluating the benefits of all those electric vehicle... mandates isn’t the difference between an electric vehicle and an old gas-guzzler; it’s the difference between an electric car and a new gas car." Did Lesser forget to mention that half the CO2 produced by a gas car was produced before the gasoline ever got into its gas tank? Funny how these fossil-fueled wonks keep leaving that little detail out of their analysis. By force of omission, they let the public keep the fantasy that the gasoline you put in your tank just came out of the ground that way, right there at the station...
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ab at 03:09 AM on 22 May 2018Trenberth can't account for the lack of warming
How does Trentbergh explain that it is hotter on the International Space Station (ISS) (121°C facing the sun) than on the Earth's surface (14°C average), while his energy budget claims that the Earth's surface emits more energy as infrared (396 W.m-2) than the total incoming solar irradiance (340 W.m-2) ?
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Evan at 01:14 AM on 22 May 2018Yes, EVs are green and global warming is raising sea levels
We drive an EV in Minnesota, and Connexus power company has a program for off-peak charging that uses 100% wind power. Obviously not every electron coming over the grid came from a wind turbine, but Connexus explains it this way.
Energy comes from all kinds of sources: wind, natural gas, coal, and more. Once it hits the power grid, there’s no way of telling where it came from. However, when renewable energy is added to the mix, a renewable energy credit (REC) is created that embodies all the environmental benefits of that energy. When you enroll in the Time-of-Day Program, we’ll dedicate wind energy RECs on your behalf, completely offsetting that energy used to power your electric vehicle.
Enrolling in such a program moves us closer to cleaner transportation and sends a clear signal to the power company that one more person is encouraging them to put up more wind turbines.
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ab at 18:25 PM on 21 May 2018Radiative Balance, Feedback, and Runaway Warming
Radiative balance is on the title, yet, nothing about it in the post. This is where IPCC is blatantly wrong: on Earth, there has to be radiative imbalance, because there is life.
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ab at 18:23 PM on 21 May 2018Measuring Earth's energy imbalance
The very first sentence of the post is wrong: "When the Earth is in energy imbalance, with more energy coming in than radiating back out into space, we experience global warming."
Earth is not the moon. On Earth, life transforms incoming solar energy into biochemical energy. So there has to be a radiative imbalance in order for life to develop and sustain itself.
Moderator Response:[DB] Thank you for taking the time to share with us. Skeptical Science is a user forum wherein the science of climate change can be discussed from the standpoint of the science itself. Ideology and politics get checked at the keyboard. When making assertions running counter to accepted science, it is incumbent upon the user (you) to furnish citations to credible sources that support your contentions.
Please take the time to review the Comments Policy and ensure future comments are in full compliance with it. Thanks for your understanding and compliance in this matter.
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Riduna at 09:58 AM on 21 May 20182018 SkS Weekly Climate Change & Global Warming News Roundup #20
Mean global warming could exceed 1.5°C above preindustrial temperature with a decade and it is becoming increasingly likely that it will exceed 2°C by 2100. As implied by the article, this is likely to pose serious problems for ability of the human population to produce the food needed to sustain itself.
This will be the outcome if temperature increase adversely effects the ability of insect pollinators to survive. Without them it will be impossible to maintain the present, let alone an increased quantity of agricultural production needed to feed a growing global human population.
However, the prospect of mass starvation seems unlikely to result in more rapid efforts at decarbonising the economy – unless widespread financial gain is to be had from doing so.
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michael sweet at 09:02 AM on 21 May 2018Global solar capacity grew faster than fossil fuels in 2017, says report
John ONeil,
Actual generation is shown in the second graph of the OP. Last year renewables (excluding hydro) generated 12.1% of global electricity. Renewables generated only 6.1% in 2010 so the amount of renewables has doubled in the past 7 years.
Renewables have only been cheaper than fossil fuels for less than 7 years so one would expect renewables to obtain market share faster in the future since they are the cheapest energy today.
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nigelj at 06:06 AM on 21 May 20182018 SkS Weekly Climate Change & Global Warming Digest #20
Regarding water resources: NASA Satellites Reveal Major Shifts in Global Freshwater
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John ONeill at 23:15 PM on 20 May 2018Global solar capacity grew faster than fossil fuels in 2017, says report
Actual generation is a better metric than capacity or investment, since coal and gas usually have higher capacity factors than wind and solar, and lower installation costs.
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shepard145 at 13:12 PM on 20 May 2018CO2 is just a trace gas
The discussions on this page are disappointing - childish word games. The only question that matters is: "does throttling a trace gas CO2 result in human control of the climate and weather." - a global thermostat. The answer is “no”, so the entire global warming fraud and everything about it is irrelevant – including solar /wind power and electric cars and all the green marketing. None of it is relevant. Unfortunately this post was too late to save the 100,000 US coal minors who lost thier jobs.
Moderator Response:[TD] Provide a peer reviewed reference for your unsourced assertion that 100,000 coal miners were illegally underage.
[PS] This post is nothing but sloganeering. This is a science-based site. You must provide supporting evidence preferably from peer reviewed literature to back your comment. Opinions based on your preference or political leaning have no place here. You may find rants like this more welcome on sites like WUWT.
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teacher at 12:40 PM on 20 May 2018Humans are too insignificant to affect global climate
Thanks for taking the time to respond and to give me advice everyone. I definitely have a more detailed lesson plan and more graphs for students to analyze.
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nigelj at 07:08 AM on 20 May 20182018 SkS Weekly Climate Change & Global Warming News Roundup #20
A little more detail on the decline in insect numbers according to research discussed here.
"The number of flying insects had plunged by three-quarters in the past 25 years in Germany and very likely elsewhere." “We know that many insects are in rapid decline due to factors such as habitat loss and intensive farming methods,” ......in the future, these declines would be hugely accelerated by the impacts of climate change, under realistic climate projections."
A decline of three quarters is more than I was expecting, and is quite astonishing. This must impact the entire ecosystem, and pollination of plants and the number of birds. Sure enough it does in this article . The scale of change is pretty astonishing.
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scaddenp at 14:01 PM on 19 May 2018Humans are too insignificant to affect global climate
Hmm. The extremely tricky bit is how are 7th graders going to evaluate the reliability of source information? With so much misinformation, misrepresentation of science, and downright false information out there from motivated reasoners, it is a minefield to navigate. Even limiting to "peer reviewed" research is complicated by predatory journals. This website delivers good guidelines but 7th graders just dont have those skills. For that matter, many gradutes dont have/use those skills. Everyone of us is prone to motivated reasoning.
To my mind, what 7th graders need to know is what the scientific consensus is.
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