It will have nothing to do with humans.

http://io9.com/earth-will-turn-into-a-ve...n-pre-961194748

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According to Robinson and Goldblatt, it’s likely impossible for human activity to induce a runaway greenhouse effect. To do so, we’d have to raise the concentration of CO2 in the atmosphere to around 30,000 parts per million. This is considerably more that could be attained even if we burned all the available fossil fuel reserves on the planet — 10 times more to be exact.

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They'll be in charge...