I'll bite. I think we can agree the climate is one of those most complex systems on the planet. We should be able to agree the modeling systems are consistently getting it wrong with their predictions. While what you are saying may be entirely correct, it is based on the supposition that the system is completely and fully understood and that the observation does not demonstrate a correlation, but the causation as postulated. It also requires that some part of the system previously unknown or understood will not correct as part of a feedback loop.
Additionally, it is my understanding that as it is, we are only at a fraction of the estimated high, give or take a few % points of the estimated high for CO2 contained in the atmosphere since the meteor took the dinosaurs?
While some may believe (still have a strong suspicion that dollars has a lot to do with one's conviction on the topic) that humans account for all of it, again, I'll go back to we are trying to predict a very complex system and I do not for minute we have anywhere near all the input variables and feedback loops identified to know without question what is happening, why it's happening or what is going to happen.
Hey, I appreciate your discourse on the subject. I seriously do. But do you know how many times in history people have become absolutely convinced the world was going to end and they could explain why? I suspect you might and given all the above, it is why I'm skeptical when a new crowd jumps up and screams the sky is falling.
Thanks for the cordiality.
First of all, the world is not going to end, the sky is not falling. And on that note, there was recently news that the IPCC is retiring the RCP 8.5 emissions scenario, which was considered as a “worst case” or “business-as-usual” scenario. The world has already made great progress on climate change. Excluding China, global emissions are dropping. China is still developing and burning lots of fossil fuels, but they are also leading the way in building out alternative energy, battery storage, and EVs. Globally, we’re on a promising trajectory. We’re not keeping warming to the 1.5-2 C target all countries agreed to, but 2.5-3 C is very realistic, and hopefully not that bad. That said, we should still be making reasonable efforts to improve. A half degree may well be the difference in some low-lying nations (and US cities!) being wiped off the map. And if we don’t want China to be the energy superpower of the future, we better keep up.
In the US, we mostly have piecemeal command-and-control style climate policies, which are generally inefficient. I would prefer a more systemic, market-based approach, and have advocated for policies such as revenue-neutral carbon fee and dividend. Not that that discussion goes anywhere on this forum. But whatever, we are getting there. Two steps forward one step back. I’m hopeful AI and other technological advances continue to accelerate the clean energy revolution.
I don’t really see a specific question or suggested explanation for stratospheric cooling here, just a general vibe that “climate is complicated”. I get that. But forget about the nitty-gritty internal dynamics of the system for a second, and just consider the boundary conditions. If heat entering the system is greater than heat leaving the system, the temperature goes up. We can directly measure the heat entering and leaving the system. The heat entering the Earth system is relatively unchanged; the heat leaving the system has decreased. This is consistent with the increased greenhouse effect.
CO2 and other greenhouse gases absorb and emit IR radiation in the lower atmosphere. In the upper atmosphere it’s basically just CO2 and ozone. Looking down from above, the upper CO2 sees less and less IR radiation to absorb the higher you go. But the upper atmospheric CO2 is still emitting heat, half of it to space. The amount of heat leaving the upper atmosphere exceeds the amount of heat entering, therefore, it cools. Yet the Earth system as a whole is warming, because it’s becoming less efficient at getting rid of heat. This phenomenon is only consistent with the increased greenhouse effect, and not “natural cycles”.
And it’s not just the vertical temperature profile of the atmosphere that tells us it’s the greenhouse effect. We directly measure the spectrum of radiation in and out, and see most of the changing flux is specifically in wavelengths absorbed by CO2 etc. The evidence is quite conclusive.