The US is home to only 4% of the world population, but contributes about 25% of the greenhouse gas pollution that causes global warming. Though this figure applies specifically to greenhouse emissions, the numbers are similar for many other types of pollution as well. In general, the United States is responsible for roughly one fourth of many of the most important pollutants. This gives us a special responsibility to clean up our sources of pollution and lead the way for the rest of the world.
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