Car emissions are a major source of pollution
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.[2] It was the largest for decades. This puts vehicle emissions in the United States as one of the largest greenhouse gas emitters in the world.
That is a problem. The United States is dependent on vehicle travel for everything—commuting, shopping, travelling, and more. American cities and suburban areas are structured around the car. This is changing,[3] but it will not change overnight. And it will not change for everyone. Many people will remain in suburban areas that require cars for part of their daily lives. Part of that will be by choice, while for others it will be out of necessity. Not everyone can afford to live by a great mass-transportation line, or a bike path. And people who work in more rural areas will not have easy access to any transportation.
Vehicles are here to stay. They might not remain the dominant form of transportation in all areas of the United States, as cities are reshaped, but they will remain useful and vital to many people in many areas.


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