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 Virtually all human activities have an impact on our environment, and transportation is no exception Transportation is crucial to our economy and our personal lives It is also, however, a significant source of greenhouse gas emissions In 07, transportation accounted for 29 percent of total United States GHG emissions The 'greenhouse effect' is the warming of climate that results when the atmosphere traps heat radiating from Earth toward space Certain gases in the atmosphere resemble glass in a greenhouse, allowing sunlight to pass into the 'greenhouse,' but blocking Earth's heat from escaping into spaceWest's team found that reducing greenhouse gas emissions could prevent approximately 05 million premature deaths due to air pollution in 30, 13 million in 50, and 22 million in 2100 The economic value of these health benefits was estimated at between $50 and $380 for every ton of carbon dioxide cut, which is greater than the predicted Historical Analysis Of Clim