I'm not too worried about cooling Earth's radiator. The planet still has its radioactive core, which won't burn out until long after the sun goes nova.
From all I've read, we don't have to worry about solving the problem by next week, but in the very long view, humans have about 10,000 years before all the known reserves of carbon-based fossil fuels are exhausted. If they don't find some more stuff to burn before then, there will be no choice but to go nuclear or think of something else really clever.
Considering the advances in power technology of the past 200 years, the 10,000-year long view doesn't seem so scary.
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Who are all these people and what do they know? 
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