The United States is the world’s leading air polluter, responsible for one fourth of all carbon dioxide emissions.
Carbon dioxide emissions result from burning fossil fuels, such as gasoline, oil, natural gas, and coal.
China is the world’s second worst air polluter, accounting for 12 percent of carbon dioxide emissions, followed by Russia, Japan, Indonesia, and India.
Most of these emissions result from industrial activity.
But automobiles contribute greatly to the amount of carbon dioxide sent into the atmosphere, and America has more cars than any other country in the world.
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