In 1900, Americans owned 8,000 cars, in 1920, they owned 8 million, and in the year 2000, there were more than 220 million – more than one car for every person over the age of 18. (source: gdintegrated.com)
The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation. (Source: epa.gov)
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