The world's biggest climate agreement goes into effect tomorrow - here's what it actually means

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Barack Obama Ban Ki-Moon Paris Agreement

How Hwee Young/Reuters

Barack Obama and UN Secretary General Ban Ki-moon after a joint ratification of the Paris Agreement by the US and China

On November 4, the Paris Agreement goes into effect around the world. The 92 countries that have ratified the agreement so far have all pledged to do their part to keep the earth's temperature from rising more than 2 degrees Celsius, or 3.6 Fahrenheit.

Here's what that means.

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