A. produces much more global warming than a carbon-dioxide forcing of the same magnitude B. contributed to 25 percent of observe

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问题 A. produces much more global warming than a carbon-dioxide forcing of the same magnitude
B. contributed to 25 percent of observed global warming
C. winter and spring
D. the warming effects increase
E. still surpass soot in warming the world’s climate during the last century
F. can be seen mostly in the Northern Hemisphere
Hansen cautioned that greenhouse gases___________.

选项

答案B

解析 本题定位到第六段汉森提醒大家注意的话。温室气体仍是导致全球变暖的最主要因素。
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