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1.The impact of global warming could be twice as severe as United Nations scientists had previously feared the world’s largest climate-modeling experiment has shown.2.Average temperature could rise by 11℃（20°F）to reach highs that would change the face of the globe, which is said by researchers who have run 60000 computers simulations of climate change.3.Additionally, students were more likely to report observing aggressive driving, engaging in aggressive driving themselves, or having more feelings of anger and hostility on cloudy days than on sunny day.