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14 de may. de 2024 · In the United States, greenhouse gas emissions caused by human activities decreased by 2.3 percent from 1990 to 2021, down from a high of 15.8 percent above 1990 levels in 2007. Carbon dioxide accounts for most of the nation’s emissions and most of the decrease since 1990. Transportation is the largest source of 2021 greenhouse gas emissions ...
