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 In 19, greenhouse gas emissions from transportation accounted for about 29 percent of total US greenhouse gas emissions, making it the largest contributor of US greenhouse gas emissions In terms of the overall trend, from 1990 to 19, total transportation emissions have increased due, in large part, to increased demand for travelCarbon dioxide (CO 2), which causes 9–26 percent;Greenhouse gas emissions increased 70 percent between 1970 and 04 Emissions of carbon dioxide, the most important greenhouse gas, rose by about 80 percent during that time The amount of carbon dioxide in the atmosphere today far Causes Of The Greenhouse Effect Conserve Energy Future Causes of greenhouse gases images