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Barack Obama
Climate breakthrough
Climate breakthrough

The deal made by Chinese leader Xi Jinping and President Barack Obama to limit greenhouse gases from those two nations represents the most significant action in the fight against climate change in years. Suddenly, it appears international progress is possible in combating one of the most serious threats facing humanity — if the effort is not completely undermined by Congress, that is. The United States and China are the top two producers of greenhouse gases, accounting for an estimated 40 percent of the worldwide total. That means the agreement under which the countries would gradually ratchet down emissions — China would reach peak emissions no later than 2030 and the U.S....