Earlier this year, the earth hit a frightening milestone: carbon dioxide in the atmosphere reached its highest level since humans have inhabited the earth. The last time there was this much carbon on the planet was nearly a million years ago.

As the heat-trapping gas proliferates, the world warms, and the climate effects domino: droughts intensify, floods increase, ice melts and seas rise. The question now isn’t whether human activity is changing the global climate; the question is what to do about it.

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