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.