Who is the biggest transport polluter in the world?
The United States is by far the largest producer of transportation emissions worldwide.
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Greenhouse Gas Emissions, Past and FutureChina, the world's biggest emitter of carbon dioxide, produces 12.7 billion metric tons of emissions annually. That dwarfs U.S. emissions, currently about 5.9 billion tons annually.
Car emissions are a major source of pollution. Cars and trucks emit twenty percent of all greenhouse gases emitted in the United States[1], which is the second largest greenhouse gas emitter in the world.