[单项选择]Climate Change : The Long Reach 　　1 . Earth is warming. Sea levels are rising. There ‘s more carbon in the air, and Arctic ice　is melting faster than at any time in recorded history. Scientists who study the environment to　better gauge (评估) .Earth’s future climate now argue that these changes may not reverse for a very long time . 　　2 . People burn fossil fuels like coal and oil for energy. That burning releases carbon dioxide, a colorless gas . In the air , this gas traps heat at Earth’s surface . And the more carbon dioxide　released , the more the planet warms . If current consumption of fossil fuels doesn’t slow ,　the long-term climate impacts could last thousands of years-and be more severe than scientists had been expecting. Climatologist Richard Zeebe of the University of Hawaii at Manoa offers this conclusion in a new paper. 　　3. Most climate-change studies look at what’s going to happen in the next century or so .　During that time, changes in the planet’s environment could n

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