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> It is absurd to suggest that anyone "knows" what a system as complex as the Earth will be like in the future. Many people believe that this is the most likely future, and I'm sure some of them don't care.

it's absurd to suggest radiative transfer and heat retention aren't well understood scientific phenomena.

Is your argument "the earth is complicated enough that nobody can ever understand it completely, so don't even bother"? Because that's a laughable attitude.

Regarding your exhalation comment, the specific problem is not CO2 itself. The problem is liberating CO2 from fossil-fuel sinks where it has been sequestered away from the atmosphere for millions of years.

And I think your comments come to the real problem for people with controlling greenhouse gases. My dad is in this boat. He might say "I deny that my actions hurt the earth. I don't want to look at the evidence, and I don't trust anyone who says I might be doing damage by driving a gas guzzler. I deny I could be hurting things. I refuse to believe anything that leads to that conclusion".