The Paris Climate Agreement: Why 2 Degrees C?

On December 12th, 2015, which happens to be my birthday, the world received a historic gift. On this Sunday morning, I reflect on this global step towards good stewardship of the planet, the only one we have to support billions of people.  At the Conference of the Parties-21 (COP21) in Paris, a major international agreement supported by nearly 200 countries was offered. Rather than lay out the details and why this one differs significantly from previous efforts, I point you to the very clearly written “explainer” in the New York Times on the implications of the agreement. But, why is 2 degrees C the internationally accepted threshold?

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