100 days to save the world

We've learned to be pessimists about climate change.

Every so often, we hear news about world leaders meeting in some exotic-sounding location -- Copenhagen, Lima, Durban, Kyoto -- to try to hammer out an agreement to curb heat-trapping gases. We know the stakes are huge -- nothing short of the fate of this planet -- but it's become difficult to expect much out of diplomacy.

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Source: CNN