This week, diplomats from around the world have gathered in the southern Polish city of Katowice in an effort to put the 2015 Paris climate accord into practice.
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Efforts to prevent the possibly catastrophic consequences of climate change may well depend on cooperation between today's two biggest geopolitical rivals: the US and China. Once the world's top polluting nation, the US has been eclipsed in recent years by China. Here's a look at the global share of CO2 emissions in 1980 vs. 2016.