I think we should just focus on not polluting the atmosphere. Not because of a concern born of megalomania but because its just the right thing to do.
There is a lot of dissent and disagreement on the causal relationship between our actions and the climate. I think we (earthlings) stand a much better chance of reaching a consensus that we should stop polluting the air.
While the premise of global warming is not unreasonable, it is far from conclusively definitive so its effectiveness as a basis for policy decisions is very limited.
The easiest way to lose an argument even when you are right, is to base your position on a premise that is as easy to disprove as it is to prove.
Manhatten was under a mile-thick sheet of ice 20,000 years ago - that was ten minutes ago in geologic terms. Had a civilized human race been established at the time, I don't think there is anything we could have done to stop the last ice age and there is nothing we can do to stop the next one.
However, I think most reasonable people and nations would agree that we shouldn't piss in each other's water supply nor should we fart in each other's air supply.
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