??? It's not 'highly speculative'. We can actually measure very precisely exactly how much IR is 'shielded' at 150, 200, 400 etc, etc. I have over 15 years of experience in the nuclear industry. A big part of that is radiative shielding. That's what CO2 is.... it's a shield to photons in the IR spectrum. Calculations made in 1896 have been shown to be very accurate. We're finding the amount of increase in the thermal heat content in the oceans as the models predicted we would find. How is that 'speculative'?
The Theory backing Global Warming is probably one of the most 'proven' theories in the history of science to the extent that a theory can ever be proven. It's probably impossible for it to be any more proven than it is. We even have real world examples of the effect of CO2. Wanna know what happens if you cram 90 Bar of CO2 onto a planet then block ~97% of the incoming radiation? Look at Venus. Wanna know what happens when you suck ~40% of the CO2 out of the atmosphere and dissolve it into the oceans? Look at Ice Cores revealing Earths climate history.
For Global Warming to be wrong either quantum mechanics is wildly off or thermodynamics is wildly off. The probability of either of those being wildly off with the accuracy of the predictions they make is as close to 0 as you can get.
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