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Transportation Pollution and Global Warming

NASA, June 2009

The main anthropogenic global warming culprit is carbon dioxide (CO2), but human activity produces a host of other, shorter-lived pollutants that contribute to climate change, among them gases that react to form ozone smog and fine particles such as black carbon. Until recently, most of the attention paid to these short-lived pollutants focused on their threat to human health. But because these pollutants disappear from the atmosphere relatively quickl