Economics
Cars Become Biggest Driver of Greenhouse-Gas Increases
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The greatest emerging threat to the global climate may rest in the side pocket of your trousers -- or wherever you keep the car keys.
Emissions from transportation may rise at the fastest rate of all major sources through 2050, the United Nations will say in a report due April 13. Heat-trapping gases from vehicles may surge 71 percent from 2010 levels, mainly from emerging economies, according to a leaked draft of the most comprehensive UN study to date on the causes of climate change.