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It has been hotter than it is now, in the distant past. And the carbon dioxide level has been higher than it is now. How does this matter?
What matters is that we understand the past, and that we understand our affect on the Earth now, and how that will affect our future. Change will affect us, and rapid change will be much worse.
Listen, do you think that all the humans who are alive now now should try to burn up as much coal, oil, and natural gas as we can, as quickly as we can?
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