Three of the leading contributors to pollution, the United States, Brazil, and China, announced this week that they were making meaningful progress toward an agreement to be reached in Paris later this year.
Together, China and the United States make up a substantial portion of the world’s population. Brazil’s booming economy means that it, too, will be in the ranks of leading polluters one day in the visible future.
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China has the most ambitious plan of the three, aiming to reduce carbon density levels (the level of carbon emitted per capita) by up [...]