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Nope, we haven't. Here are the unresolvable issues:Metsfanmax wrote: This story is interesting (or it would be if I hadn't heard you complain about regulation on hempcrete several times before), but it misses one key point: there's a huge difference between a direct and transparent fee on a good, and regulation. I am not advocating regulation since I don't think the government can do a great job predicting what the correct energy sources are for our economy. Instead, I advocate for a fee on fossil fuels to represent the fact that every time you buy the fuel with the intent to burn it, you are doing harm to others, and that harm is not reflected in the price you are paying. (BBS and I have discussed this in another thread; I believe this is true because most consumers don't really understand the future impacts of global warming, and don't appreciate or care about the impacts it will have on people that live far away from them. However, we never finished this conversation, I think.)
I agreed with you on this one. With the current state of things that are knowable, any time we actually try to estimate the true social cost of carbon, the uncertainties will be so large as to render it a fairly useless estimate. However, one could be confident that a large tax (reasonably defined) is better than a small one (again reasonably defined), if one accepts the fairly large impacts associated with climate change. That is, better to err on the side of caution on this problem, assuming that the larger tax has a proportionally larger effect on decreasing greenhouse gas emissions.BigBallinStalin wrote: Tax cap sounds great, and it's probably the best government policy for addressing the externalities of pollution; however, the optimal price is unknown, so the optimal tax is unknown (knowledge problem: besides, there's more than one price when it comes to that Pigouvian framework).
Sure, this is something to consider. But there are other considerations which compete with it. For example, we are doing some pretty severe damage to low-lying nations with our greenhouse gas emissions, but it's something that we may never directly feel the effects of here in the US (though we might, because of political instability that results.) Since different actors see much different outcomes from purchasing the same product, I'm not even sure that such a number would be practically useful if we could know it.There's the demand revelation problem: what actually is the socially beneficial quantity of goods from pollution demanded.
This is a very real concern for us. However, note the current political realities in the US. With the new Congress taking place, there's no way to get the environmentalist-friendly legislators to push this through on their own. So at least with my lobbying group, we're focusing 100% on doing this with conservative co-sponsors, or not at all. That should hopefully minimize these effects -- revenue-neutrality of the bill is what attracts the conservatives in the first place. Obviously I can't guarantee that it won't happen though. But I think that a Republican Congress is a gift to us, in that sense.Then there's the incentive problem: both you and I agree on a carbon tax, and let's say we rack our brains to get the best rate we could determine. What happens when we offer our plan to a few legislators? Well, they'll likely be favorable to it (because we picked environmentalist ones--since we're good at political entrepreneurship), and then they have to haggle with other legislators to pass the bill (at a committee level, then at the general assembly level).
Meanwhile, many underground deals will be made among legislators and special interest groups--while an overt exchange is made among legislators and voters (insert sentimental advertising campaigns--with the ongoing rage and stupidity of democratic interaction). After this political process (of nonsense), I'd expect to get a very fucked up version of our plan which will probably be poorly enforced or gouged to the point of ineffectiveness.
Part of why I have to reject this view is that if we resign ourselves to this, it is guaranteed to continue. Citizens have to demand rational action from their government on relevant issues, and that's what I'm trying to do. It's not just about climate change or a carbon tax; it's about insisting that our legislators listen to those who don't have the same vested interests that they do.This is generally why I don't trust government to handle these issues, but utlimately, this conclusion is my opinion--informed by theory and by a smattering of empirical evidence on somewhat related issues. I'm open to refutation and discourse, but 'refutation and discourse' are not part-and-parcel of the political process. It's not about science; it's about rhetoric and generally zero-sum or negative-sum exchanges.
Of course the government would levy the fees. My point was that I am the one advocating for it here, so address your arguments to me, not to "the government."shickingbrits wrote: Mets, you say you are not the government. Who would you have levy the fees?
No, it's not. British Columbia has been doing it for years.A 100% return to citizens? I think you know that that is impossible.
Taxes decrease demand for everyone, it's just a larger effect on those with smaller incomes. But either way this point is not really responsive because I was just taking exception to your claim that the government uses taxes to stimulate fossil fuel emissions. The only way that could be true is if people burn more gasoline when it's more expensive (I think it's obvious why this is false)."2) This argument doesn't really make sense. The existing taxes weren't somehow encouraging use of fossil fuels; taxes generally serve to decrease demand, not increase it, due to the increased price. So, adding another tax to further decrease demand isn't a new conflict of interest, it's just a continuation of existing policy."
I have many issues with this. First, you are coming with a bit of BBS on this. Some things aren't voluntary exchanges. Increasing tax only offsets the lowest consumer when the exchange is involuntary, if suitable alternatives aren't available.
Sure, it's true that by having high fossil fuel taxes, the government might have an interest in not diminishing the amount of fossil fuels. But nevertheless, the US has its CAFE standards, British Columbia has a $30/ton carbon tax, and 20-odd other localities have some sort of carbon pricing scheme in effect. The inevitable conclusion this leads to is that there isn't only one government perspective on this. Most governments are far too large and far too complex to speak of the "interest" of the government. Gasoline taxes for things like highway repair are obviously just being used for different ends than a straight carbon tax would be, and they might have conflicting interests, but so does many, many things the government does. (Especially when you consider the conflicts between provincial/state and federal taxes.)The second, "they are not encouraging fossil fuels". Of course they are. The taxes are discouraging the government from taking action against their self-interest. If you want to show me graphs on the Prius, then that shows a poor understanding of fuel economy. The VW Rabbit diesel had better mpg than a Prius more than 30 years ago, far more miles per engine and doesn't require rare earths. In other words, the life cycle of the Prius sucks in comparison.
Yes, but now these things are available to the consumer market. The government can't, and isn't, keeping these things locked up forever.When the Nissan Leaf came out, at least in China, it was restricted to government use. When the Ford Fusion plug-in came out, it was restricted to government use. While these have the same issues as the Prius, at least they give better mpg.
This is a simply false analysis. For example, if the US had gone full throttle for nuclear power starting from the 1940s, we still could have had world dominance in the energy market due to our technological superiority, if we had handled it well. We just went a different route. And we can still go a different route. Our economy is so large that whatever energy markets we invest in, we'll maintain relevance. And your biofuel example proves the same point. It didn't have to be oil.For a long time, the US government has tied itself, the economy and the world to oil. With a more widely available form of energy, the US would plummet in world standing. That is, the quality of life would increase everywhere, including the US, but in comparative turns, the US would be on the same level as a third world country. The world would be more balanced and small nations and individuals would not be readily exploited.
I will address you as long as you address me. But "you" spend most of your time addressing the government. You don't and can't ever get me to pay you. You can get the government to make me pay them and then try to get something out of it.Metsfanmax wrote:Of course the government would levy the fees. My point was that I am the one advocating for it here, so address your arguments to me, not to "the government."shickingbrits wrote: Mets, you say you are not the government. Who would you have levy the fees?
No, it's not. British Columbia has been doing it for years.A 100% return to citizens? I think you know that that is impossible.
Taxes decrease demand for everyone, it's just a larger effect on those with smaller incomes. But either way this point is not really responsive because I was just taking exception to your claim that the government uses taxes to stimulate fossil fuel emissions. The only way that could be true is if people burn more gasoline when it's more expensive (I think it's obvious why this is false)."2) This argument doesn't really make sense. The existing taxes weren't somehow encouraging use of fossil fuels; taxes generally serve to decrease demand, not increase it, due to the increased price. So, adding another tax to further decrease demand isn't a new conflict of interest, it's just a continuation of existing policy."
I have many issues with this. First, you are coming with a bit of BBS on this. Some things aren't voluntary exchanges. Increasing tax only offsets the lowest consumer when the exchange is involuntary, if suitable alternatives aren't available.
Edit: it occurs to me that you may be arguing for the existence of a Laffer curve here. Let me know if that is what you are getting at.
Sure, it's true that by having high fossil fuel taxes, the government might have an interest in not diminishing the amount of fossil fuels. But nevertheless, the US has its CAFE standards, British Columbia has a $30/ton carbon tax, and 20-odd other localities have some sort of carbon pricing scheme in effect. The inevitable conclusion this leads to is that there isn't only one government perspective on this. Most governments are far too large and far too complex to speak of the "interest" of the government. Gasoline taxes for things like highway repair are obviously just being used for different ends than a straight carbon tax would be, and they might have conflicting interests, but so does many, many things the government does. (Especially when you consider the conflicts between provincial/state and federal taxes.)The second, "they are not encouraging fossil fuels". Of course they are. The taxes are discouraging the government from taking action against their self-interest. If you want to show me graphs on the Prius, then that shows a poor understanding of fuel economy. The VW Rabbit diesel had better mpg than a Prius more than 30 years ago, far more miles per engine and doesn't require rare earths. In other words, the life cycle of the Prius sucks in comparison.
Regarding your argument about the Rabbit: it's a false comparison. First, the Rabbit was popular right after the height of the oil crisis; that is, it was only high fuel prices that encouraged innovation towards efficiency. This supports the hypothesis that a carbon tax would spur us towards more fuel-efficient vehicles. Second, the Rabbit is just one car. Not everyone wants to drive a Volkswagen. What matters is when the average fuel economy goes up across the board, so that no matter what the consumer's preference is, he or she can purchase a car that they like and is also better on fuel.
Yes, but now these things are available to the consumer market. The government can't, and isn't, keeping these things locked up forever.When the Nissan Leaf came out, at least in China, it was restricted to government use. When the Ford Fusion plug-in came out, it was restricted to government use. While these have the same issues as the Prius, at least they give better mpg.
This is a simply false analysis. For example, if the US had gone full throttle for nuclear power starting from the 1940s, we still could have had world dominance in the energy market due to our technological superiority, if we had handled it well. We just went a different route. And we can still go a different route. Our economy is so large that whatever energy markets we invest in, we'll maintain relevance. And your biofuel example proves the same point. It didn't have to be oil.For a long time, the US government has tied itself, the economy and the world to oil. With a more widely available form of energy, the US would plummet in world standing. That is, the quality of life would increase everywhere, including the US, but in comparative turns, the US would be on the same level as a third world country. The world would be more balanced and small nations and individuals would not be readily exploited.
(But again, direct your arguments at me, not the government. This argument you're taking is lazy. It's saying "here are the things government wants to do." When did we stop talking about the things the citizens want to do? Why is the default argument now "that will never happen?" That's ceding away power in a way that guarantees that only government interests matter.)
shickingbrits wrote:Maybe I'm not as good at calculating ROI as you are. In my world a $454 monthly savings works out to 5448 per year, which is 54.5% of capital expense returned. Or in the course of 25 years, 126,200 saved.
I don't want you to pay me. You would likely come out ahead -- that is, you'd have more real income after the revenue-neutral carbon tax than before it. But the reason we have to use government here is one of incentives. If fossil fuels are cheaper than other sources of energy, people will use them. However, if there's a financial incentive to switch to renewables, that will then happen. A carbon tax would encourage this by making fossil fuels more expensive than the alternatives; if you stopped using them altogether, you'd get a free check (corresponding to your share of what everyone else is burning) until we switched off entirely. I'm not trying to take money away from the people, since I demand that it be returned.shickingbrits wrote: I will address you as long as you address me. But "you" spend most of your time addressing the government. You don't and can't ever get me to pay you. You can get the government to make me pay them and then try to get something out of it.
That's true. I pointed out merely to demonstrate that revenue neutrality in such a proposal is quite feasible.You say that many places have a carbon tax in effect, and quote at $30/tonne. According to the most popular estimates from the changist crowd, they require ten times that amount to tackle the issue.
Correct. If we instituted a $300/ton tax that was off one year and on the next, it would devastate the economy. It has to start small and gradually increase over time to give businesses and individuals time to react.It's nice to slip it in at a low amount and then once on-board, increase it.
I didn't say anything about uranium specifically. Just like the fossil fuel industry, the nuclear industry would have innovated if we had let it. (Indeed, it is innovating in places where the government is allowing it to, like China and India.)Your analysis of my false analysis is false. Uranium has an inherent problems. Not widely available, poses many dangers and can be weaponized. If we had gone full throttle on uranium from the 40's, we would have no uranium left. If we had done the same with thorium, then the world be much further ahead than we are.
Even if you don't believe in or care about the future impacts of climate change, this tax is going to make you money. And it's going to improve the economy. What's not to like?Again, back to addressing you. If you want to sell me something, then you need to offer me a benefit. If you say the benefit is my future and my children's futures, then you better be holding a gun to my head, because you have no clear and present danger to threaten me with even after 30 years of trying to find it.
This is the nature of democracy. If all you do is complain, then you're going to be doing that forever.When did "citizens" ever get to decide anything?
5) Obama has said on many occasions that he is worried about jobs, so there is a conflict on interest when he starts to tax incomes.Metsfanmax wrote:1) Non-unique: there's usually a conflict of interest when the government collects any tax revenue, because of the way state budgets usually work.shickingbrits wrote: Now, I'm not a lawyer, but there may be a conflict of interest when the same government starts complaining about fossil fuel emissions and states they want to levy a further tax because of them.
2) This argument doesn't really make sense. The existing taxes weren't somehow encouraging use of fossil fuels; taxes generally serve to decrease demand, not increase it, due to the increased price. So, adding another tax to further decrease demand isn't a new conflict of interest, it's just a continuation of existing policy.
3) I advocate for a carbon fee where 100% of the revenues are returned directly to the citizen. In this way, the government cannot use the funds to further its own interests.
4) Why are you talking about the government and its intentions? I am the one who wants the carbon tax, as a citizen; I am not the government, nor a representative of it.
We have a fundamental disagreement on the issues that face humanity. We have a fundamental disagreement on how to go about solving the issues.Metsfanmax wrote:I don't want you to pay me. You would likely come out ahead -- that is, you'd have more real income after the revenue-neutral carbon tax than before it. But the reason we have to use government here is one of incentives. If fossil fuels are cheaper than other sources of energy, people will use them. However, if there's a financial incentive to switch to renewables, that will then happen. A carbon tax would encourage this by making fossil fuels more expensive than the alternatives; if you stopped using them altogether, you'd get a free check (corresponding to your share of what everyone else is burning) until we switched off entirely. I'm not trying to take money away from the people, since I demand that it be returned.shickingbrits wrote: I will address you as long as you address me. But "you" spend most of your time addressing the government. You don't and can't ever get me to pay you. You can get the government to make me pay them and then try to get something out of it.
That's true. I pointed out merely to demonstrate that revenue neutrality in such a proposal is quite feasible.You say that many places have a carbon tax in effect, and quote at $30/tonne. According to the most popular estimates from the changist crowd, they require ten times that amount to tackle the issue.
Correct. If we instituted a $300/ton tax that was off one year and on the next, it would devastate the economy. It has to start small and gradually increase over time to give businesses and individuals time to react.It's nice to slip it in at a low amount and then once on-board, increase it.
I didn't say anything about uranium specifically. Just like the fossil fuel industry, the nuclear industry would have innovated if we had let it. (Indeed, it is innovating in places where the government is allowing it to, like China and India.)Your analysis of my false analysis is false. Uranium has an inherent problems. Not widely available, poses many dangers and can be weaponized. If we had gone full throttle on uranium from the 40's, we would have no uranium left. If we had done the same with thorium, then the world be much further ahead than we are.
Even if you don't believe in or care about the future impacts of climate change, this tax is going to make you money. And it's going to improve the economy. What's not to like?Again, back to addressing you. If you want to sell me something, then you need to offer me a benefit. If you say the benefit is my future and my children's futures, then you better be holding a gun to my head, because you have no clear and present danger to threaten me with even after 30 years of trying to find it.
This is the nature of democracy. If all you do is complain, then you're going to be doing that forever.When did "citizens" ever get to decide anything?
Libertarians say something like this often. There is some merit to it, compared to what my perspective is. Once you start to pick up an understanding of the unintended consequences that are often attached to government policy, as well as an understanding of these conflicts of interest you are describing, it is easy to see major flaws in many of the legislative agendas that governments promote. Nevertheless, I do not think we have a fundamental disagreement on how to go about solving issues, because I also don't believe that it is government that truly solves problems. Instead, I am here advocating for a position that sometimes government is necessary to help set the correct framework in which to properly resolve disputes or problems. I am sure that you value a system of rights that guarantee that you will be able to do whatever it is you like, without intervention from others. So, you likely support a police force, as well as other limited government activities such as a judicial system. Even if you do not, you surely understand the motivation by which people would want to have that, completely independent from the idea that government is trying to resolve the disputes themselves.shickingbrits wrote: We have a fundamental disagreement on the issues that face humanity. We have a fundamental disagreement on how to go about solving the issues.
I know precisely what I am advocating for. Why are you letting the government get away with this? You are arguing that since government will always corrupt a policy, that means we can never ask anything from the government, because we will never get what we want from them. But if we never ask anything from the government, we definitely will never get what we want from them. For better or worse, we have this structure of government. It plays a very important role in our lives. While change on the individual level is important, we cannot simply ignore the apparatus. I promise you that it will not disappear if you ignore it. So I will persist in telling elected officials that I want a revenue-neutral carbon tax until the day it gets signed into law. I will not accept blame if I do not get what I want. Why? Well, because if your hypothesis is correct, then my lobbying doesn't actually do anything anyway. If you really believe what you're saying, then you have to believe that I'm not going to be successful anyway, because the government isn't beholden to the interests of citizens.To be honest, you have no idea what you are advocating for. Or you do and are lying.
Scientists have indeed demonstrated that the warming until now can be attributed directly to our past carbon dioxide emissions. Would you like to see the evidence?shickingbrits wrote: Or, we have used half our fossil fuels without being able to attribute the CO2 from them to any warming.
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How does all this interplay? Since we can't actually prove that any of the warming can be attributed to CO2 in the first place, we can't do it for modern times or for our historical record,
I disdain anything found on the Daily Mail, but sure, I'll play ball. Just keep in mind that you should never treat this as a source of legitimate scientific information. They mastered clickbait well before HuffPo and BuzzFeed hit the scene. As you correctly indicate, very large volcanic eruptions can temporarily cause negative climate forcings, and the argument seems to be that we should just inject more greenhouse gases to compensate for it.shickingbrits wrote: http://www.dailymail.co.uk/sciencetech/ ... laims.html
Correct. The authors are warning that this could increase by a factor of 25 or more by 2050.http://www.sciencedaily.com/releases/20 ... 110737.htm
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In the second article we see that all CFC substitutes constitute a effect of 0.012 W/m^2, HFC being one of them.
I've heard of this cosmic ray hypothesis before and it's got a lot of holes. Basically, what he's doing is saying that there's as very strong correlation between CFC levels and atmospheric temperatures. But correlation, as it cannot be said often enough, is not causation. One needs to have an explanation for why CFCs would be so much more important to the climate than carbon dioxide. This makes no sense. As the other article pointed out, the radiative forcing of CO2 -- 1.5 W/m^2 -- is five times larger than the radiative forcing of CFCs. More importantly, looking at atmospheric temperatures alone is silly. Ocean temperatures have been constantly rising for the last 15 years, so he would have to be able explain that. Global warming has not really "paused" as some people say -- you can be misled if you look only at the atmosphere, since it only retains like 2 or 3% of the heat trapped.https://uwaterloo.ca/news/news/global-w ... study-says
I understand that the last one has been challenged by your community.

Take a second and think about what that means in context. (I'm not saying I agree with that particular statement, let's just go with it for a moment.) The argument here is that a 1.2 W/m^2 forcing due to the injected HFCs would be equivalent to a global summer. Now, the forcing due to CO2 is even larger at 1.5 W/m^2. This means that if the article is right, CO2 is already causing more than that global summer's worth of heating, compared to the pre-industrial era. Of course, this glosses over important differences -- the radiative forcing is just one number, but it's not the only thing that matters. Another is the lifetime of the gases. As the Mail piece points out, HFCs would break down in a few years, so that their disruptive impact would fade as the volcano's impact faded. But extra CO2 can last in the atmosphere for a hundred years or more.So 100 times gives us the temperature equivalent of a global summer.
If we take the hundredfold comment to mean the total levels of HFCs in the atmosphere, which last 15 years in the atmosphere, and say that substitute CFCs are wholly HFCs, or that the 0.012 W/m^2 effect is solely derived from HFCs, then lacking a linear regression, a hundredfold would be equivalent to an effect of 1.2 W/m^2. And is equivalent to a global summer.
It's actually very hard to answer this question. I'll be honest and say that I can't, though I'm not sure if anyone has. The problem here is that the Montreal Protocol very effectively decreased our usage of CFCs over like a five year timescale. That's a short enough change that it's possible to be mixed in with variations on the few year timescale. Also, ozone itself is a greenhouse gas, and depleting CFCs allowed it to be rebuilt. I can look into this further if you're interested, but I've never seen a quantitative estimate about this. If you look at the ocean heat content measurement above, you'll see that it's basically been rising the whole time. So I think it's fair to say that this was swamped by the effect from carbon dioxide.The two articles then seem to verify the third article, that warming was indeed caused by CFCs, whose use was decreased significantly after their ozone depletion effect was recognized. Though the article isn't specific as to the contribution of CFCs prior to 2000, it does state that the total effect from all ozone depleting substances remains at 0.32 W/m^2. Had the protocol not taken effect, the current rate would be at 0.65 W/m^2.
Given that HFC has an effect of a global summer at 1.2 W/m^2 and that all ozone depleting substances contributed 0.32W/m^2 and that they remain 15 years and longer in the atmosphere, what impact would this have on the temperature record from the seventies to now?
To me it would suggest that the initial 0.32W/m^2 would contribute to the equivalent of a quarter of a global summer, the reduction period would then maintain the contribution for 15 years and then we would see a temperature decrease following the life cycle in the atmosphere.
Does temperature data reflect this, or does it follow the steadily increasing amounts of CO2 and constantly warm each and every year?
I don't generally do it to prove the reality of climate change to anyone, but usually to teach myself more about the issue. Often people have very interesting or insightful questions that provide me with new perspectives on how to think about or argue this.DoomYoshi wrote:I have no doubt that metsfanmax will meet you on face level and try to deliver the goods, but I don't want to waste my time.
Carbon dioxide has a net warming effect on the atmosphere, not a cooling effect.shickingbrits wrote:I brought up CFCs because the article has a few points of merit on counteracting the cooling effects of a large deposit of CO2 in the atmosphere.
This isn't something that should be obvious to anyone. Carbon dioxide absorbs infrared (longwave) radiation. It does this regardless of where in the atmosphere it is. Why should it ever have a cooling effect in the upper atmosphere? Indeed, the reason it cools the stratosphere while the troposphere warms is non-trivial and requires an understanding of radiative transfer. The basic idea is that the planet is attempting to stay in equilibrium and balance the incoming radiation from the Sun. Since we know that the troposphere is warming up, that has to be balanced by a cooling off somewhere else (higher up). Indeed, the very fact that the stratosphere is cooling is good evidence that global warming is happening. The surface of Venus' atmosphere is over 800 degrees Fahrenheit. Its atmosphere is almost entirely composed of carbon dioxide, and all the evidence points to a runaway greenhouse effect having warmed up that planet. But the upper atmosphere of Venus is actually colder than our own upper atmosphere!It highlights the point that CO2 has a cooling value in the upper atmosphere, which is no surprise.

No, that was just clear evidence of warming. It doesn't prove that carbon dioxide is the source. However, this can be done empirically by measuring the amount of longwave radiation absorbed by CO2. Basically, satellites measure the amount of longwave radiation at different parts of the spectrum, and compute an equivalent temperature. Higher temperature means more outgoing longwave radiation; lower temperature means less. This is a comparison over several decades.But to your graph. I suppose this is the clear evidence of CO2 measured warming as promised.

The difference between 10^21 and 10^23.5 is a factor of 10^2.5, that is a multiplicative factor of 316. Another way to say that is a 30,000% increase. However, that's not quite the right way to read that graph. Subtract the beginning of the black curve from the end and you get an increase of about 25 x 10^22 J. It's not meant to compare to the actual amount of heat in the ocean; it's just an increase relative to a particular average. However, to get some perspective on how much that is, consider that the authors of the Levitus et al. paper where the data is coming from calculate that if all of this added 25 x 10^22 J were to be added to the troposphere right now, the average temperature would increase by 65 degrees Fahrenheit.Next, please explain the difference in atmospheric changes and ocean changes based what you explained above. Going from 10^21 J to10^23.5 J is such a small percent that it could be explained many ways.

The atmospheric system is more complicated than just an isothermal ball of gas, as you indicate. Thermodynamic equilibrium is an important foundational aspect, but it doesn't apply to the Earth as a whole to mean that the system reaches a single equilibrium temperature. This is true for many reasons. Even without complicated things like weather and convection, there would still be gravity. Plus, the Earth is not a closed system. The Sun can radiate energy into it, and it can radiate energy back out.shickingbrits wrote: I like the planet attempting to stay in equilibrium. Sounds cute. On the other hand, the second law doesn't like "the troposphere is warming up, that has to be balanced by a cooling off somewhere else."
Nature doesn't like thermal gradients, that's exactly what the second law says, and when thermal gradients do come about, nature reacts with something called weather. Nature likes vortexes, they are the most efficient way to disperse something widely.
This is quite clear. Clear enough to be called a law. It's the reason we know the core is molten. The reason we put on jackets, seal our houses to the extent that we still have decent air, the reason it is colder inland than near the sea, the reason our extremities stop receiving blood from the heart first. I don't bake a potato and a magical cool spots appears and is equal and opposite, i.e. a cool pocket. The heat radiates outward creating a new, higher equilibrium temperature throughout my house, my house radiates energy at a higher rate to the surrounding environment and the equilibrium reverts to the original.
I agree that my description was a hack, and may have been misleading. Physicists use energy conservation as an intuitive guide to what must happen, but it's not always obvious how the physics will play out to guarantee it.So please try again on explaining the cooling effect of CO2 in the stratosphere.
Reflection is not an important process here, especially in the stratosphere. The atmosphere is so thin that you can basically neglect direct reflection of sunlight in the upper atmosphere. Similarly, for longwave radiation the dominant contributor to what keeps the energy in is not scattering/reflection, but absorption. Going any further would involve a discussion of quantum mechanics. Just accept it as given that in this part of the spectrum, CO2 is really efficient at absorbing light, but the amount scattered would be very much less. In the visible (shortwave) part, neither process is important. So basically, this hypothesis doesn't hold water.CO2 reflects solar irradiation in the upper atmosphere. CO2 prevents heat from reaching the land and seas where the surface volume can hold the heat for any length of time.
You need to pay closer attention to the chart. The decrease in radiation is not happening simultaneously at all wavelengths. Instead, it is happening at precisely the same wavelengths where we know that carbon dioxide and methane (and ozone, etc.) have absorption bands. In order for any other hypothesis to explain the decreased amount of outgoing radiation, it would need to explain how it could generate decreases at precisely the same wavelengths that mimic carbon dioxide and methane, and not any others, without actually involving carbon dioxide and methane. Needless to say, we can discard that hypothesis.No, that is far from the only explanation. It's not like CO2 is chilling all by itself. It has friends.
Metsfanmax wrote:The atmospheric system is more complicated than just an isothermal ball of gas, as you indicate. Thermodynamic equilibrium is an important foundational aspect, but it doesn't apply to the Earth as a whole to mean that the system reaches a single equilibrium temperature. This is true for many reasons. Even without complicated things like weather and convection, there would still be gravity. Plus, the Earth is not a closed system. The Sun can radiate energy into it, and it can radiate energy back out.shickingbrits wrote: I like the planet attempting to stay in equilibrium. Sounds cute. On the other hand, the second law doesn't like "the troposphere is warming up, that has to be balanced by a cooling off somewhere else."
Nature doesn't like thermal gradients, that's exactly what the second law says, and when thermal gradients do come about, nature reacts with something called weather. Nature likes vortexes, they are the most efficient way to disperse something widely.
This is quite clear. Clear enough to be called a law. It's the reason we know the core is molten. The reason we put on jackets, seal our houses to the extent that we still have decent air, the reason it is colder inland than near the sea, the reason our extremities stop receiving blood from the heart first. I don't bake a potato and a magical cool spots appears and is equal and opposite, i.e. a cool pocket. The heat radiates outward creating a new, higher equilibrium temperature throughout my house, my house radiates energy at a higher rate to the surrounding environment and the equilibrium reverts to the original.
Instead, typically what does apply is called local thermodynamic equilbrium. Any given patch of the atmosphere will attempt to come into a thermodynamic equilibrium state, and that's generally assumed so that we can even speak of the temperature at a given point in the atmosphere.
But all of this is a red herring, because when I said "equilibrium" I did not mean thermodynamic equilibrium. I meant a system that is stable, i.e. not changing in time. That's generally what physicists mean when they are referring to the equilibrium of an atmosphere; but, I can understand why you were confused. One can write down equations for what an equilibrium atmosphere looks like, and it's generally some combination of temperature, pressure and density that is static with time. Notably, it won't be one that has only a single temperature. Instead, if everything is nice and static with time, then the amount of energy in the system won't be changing with time. This is the key assumption of an atmosphere in equilibrium with the incoming solar radiation: it has to radiate out to space as much heat as it is getting pumped into it. If that is not the case, then the energy is building up somewhere. And at that point, the temperature is going to continue to rise, until it's pumping out enough energy to balance the incoming energy.
All of this is to say that I can't really answer the question you're asking, because you're making some incorrect assumptions about the way the atmosphere works.
I agree that my description was a hack, and may have been misleading. Physicists use energy conservation as an intuitive guide to what must happen, but it's not always obvious how the physics will play out to guarantee it.So please try again on explaining the cooling effect of CO2 in the stratosphere.
Let's describe it in different terms. Suppose you increase the concentration of carbon dioxide uniformly throughout the atmosphere. The troposphere will warm for the reasons already discussed: the air is thick enough there that radiation from the ground is trapped by the carbon dioxide, and more CO2 means more trapped heat. So the troposphere warms. However, the stratosphere is very thin. So, the carbon dioxide will have the effect of radiating away some heat, but it's not absorbing enough from below to compensate, so energy is lost and it must cool. We can make this even simpler -- assume that the stratosphere doesn't absorb any energy at all. This is not a terrible approximation because of how thin it is. Then, adding CO2 to the atmosphere will always tend to decrease the temperature. CO2 is good at emitting energy, and so it will absorb energy from the dominant constituents (nitrogen, oxygen) and emit it to the infrared, losing it permanently. This will lead to a new equilbrium at a lower temperature. This is slightly complicated, so we can go through it in more detail if you like.
Reflection is not an important process here, especially in the stratosphere. The atmosphere is so thin that you can basically neglect direct reflection of sunlight in the upper atmosphere. Similarly, for longwave radiation the dominant contributor to what keeps the energy in is not scattering/reflection, but absorption. Going any further would involve a discussion of quantum mechanics. Just accept it as given that in this part of the spectrum, CO2 is really efficient at absorbing light, but the amount scattered would be very much less. In the visible (shortwave) part, neither process is important. So basically, this hypothesis doesn't hold water.CO2 reflects solar irradiation in the upper atmosphere. CO2 prevents heat from reaching the land and seas where the surface volume can hold the heat for any length of time.
You need to pay closer attention to the chart. The decrease in radiation is not happening simultaneously at all wavelengths. Instead, it is happening at precisely the same wavelengths where we know that carbon dioxide and methane (and ozone, etc.) have absorption bands. In order for any other hypothesis to explain the decreased amount of outgoing radiation, it would need to explain how it could generate decreases at precisely the same wavelengths that mimic carbon dioxide and methane, and not any others, without actually involving carbon dioxide and methane. Needless to say, we can discard that hypothesis.No, that is far from the only explanation. It's not like CO2 is chilling all by itself. It has friends.
Is it possible to have a useful result without considering time? Is it possible to have a result when considering time? I find it interesting how the laws of thermodynamics are considered a "red herring" when talking about global warming, at least to a changist.But all of this is a red herring, because when I said "equilibrium" I did not mean thermodynamic equilibrium. I meant a system that is stable, i.e. not changing in time.