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on the planet. "That suggests to me that we could nudge energy use down- wards in a bunch of hyper-consuming countries and not just make a more equitable world,but perhaps make ourselves healthier and happier,said lead author and professor of earth system sci- ence Rob Jackson. Americans'greatest contribution to global greenhouse gas e- missions comes from transportation,mostly from cars and trucks,according to the federal government.It's also one of the top two biggest drivers of energy use by sector(行业)，just after industrial use."It's not super hard to conclude that Americans are generally not as efficient with their energy use as they could be,"said Sarah Ladislaw,managing director of the US program