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Humans are having a hard enough time coping with the natural variability in our environment，which causes disasters such as heat

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问题     Humans are having a hard enough time coping with the natural variability in our environment，which causes disasters such as heat waves，wildfires and floods．Waiting without actions makes all three of those problems——and many more——worse．
    That was the serious warning from the world’s scientific community last week，in the latest report from the Intergovernmental Panel on Climate Change(IPCC)．The U．N．-chartered body produced its first comprehensive report since 2007 on the climate changes．
    There are some things the scientists are very confident will happen in a warming world over the next century．Sea levels will rise，threatening coastal cities and low-lying nations．Island states could get hit very hard．There are probably going to be relatively more extremely hot days than extremely cold ones．and food-borne illnesses will probably increase．
    But part of the risk of climate change is that scientists don’t have a crystal ball to foretell how，exactly．the environment will respond to rising temperatures，and they are trying to predict effects over the course of decades．The experts anticipate that forests could die off and that wetland and rain forest ecosystems could crumble．They anticipate effects on water systems just about everywhere：more flooding in many places，less water in dry areas，more humidity inhibiting human labor in wetter climes．
  There could also be some positive effects for some，the experts note．They predict fewer deaths due to cold，but more due to heat．Some areas of the planet，particularly in higher latitudes，might become more fertile．But lower crop yields elsewhere will outweigh those benefits．Indeed，the planet’s green lands along the equator might be much worse off．The scientists，for example，predict that fish and other aquatic life will flee elsewhere as ocean temperatures change．And，of course，there could be effects，good and bad，that the experts aren’t anticipating．That shouldn’t be comforting．
  The experts leave little doubt about the right response：Cut pollution to head off the worst possible consequences and prepare for the risks the world is unlikely to avoid，given its inability to slash emissions quickly．Delaying action，they note，reduces the world’s options and affords vulnerable people less time to cope．Isn’t it time we did something?
What does the last paragraph imply?
选项 A、Human beings are vulnerable groups in the world．
B、Human beings have no ability to reduce emissions．
C、Human beings are preparing for the coming risks．
D、Pollutions may be the major cause of climate change．
答案D
解析 推断题。根据题干关键词定位到最后一段。根据…the right response：Cut pollution to head off the worst possible consequences可知，减少污染可以阻止最坏结果的发生，故可推断D项“污染可能是气候变化的主因”为正确答案。A项“人类是世界上脆弱的群体”在本段找不到相关信息。B项“人类没有能力减少污染”与inability to slash emissions quickly不符，不能很快减少排放并不意味着没有能力。根据Delaying action…affords vulnerable people less time to cope可知，本句说的是将来的事情，故C项“人类正在为即将到来的危险做准备”不符合题意。故本题选D。
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