A Sunshade for the Planet
?? Evenwith the best will in the world,reducing our carbon emissions is not going toprevent global warming. It has become clear that even if we take the moststrong measures to control emissions, the uncertainties in our climate modelsstill leave open the possibility of extreme warming and rises in sea level. Atthe same time,resistance by governments and special interest groups makes itquite possible that the actions suggested by climate scientists might not beimplemented soon enough.??
?? Fortunately,if the worst comes to the worst,scientists still have a few tricks up their sleeves. For the most part theyhave strongly resisted discussing these options for fear of inviting a sense ofcom- placency that might thwart efforts to tackle the root of the problem.Until now, that is. A growing number of researchers are taking a fresh look atlarge-scale "geo-engineering" projects that might be used tocounteract global warming. "I use the analogy of methadone," saysStephen Schneider,a cli- mate researcher at StanfordUniversity in California who was among the first to drawattention to global warming. "If you have a heroin addict, the correcttreatment is hospitalization,and a long rehab. But if they absolutelyrefuse,methadone is better than heroin. "??
?? Basically the idea is to apply "sunscreen" to the wholeplanet. One astronomer has come up with a radical plan to cool Earth;launchtrillions of feather-light discs into space, where they would form. a vast cloudthat would block the sun's rays. It's controversial,but recent studies suggestthere are ways to deflect just enough of the sunlight reaching the Earth'ssurface to counteract the warming produced by the greenhouse effect. Globalclimate models show that blocking just l. 8 per cent of the incident energy inthe sun's rays would cancel out the warming effects produced by a doubling ofgreenhouse gases in the atmosphere. That could be crucial,because even the mostsevere emissions-control meas- ures being proposed would leave us with a doublingof carbon dioxide by the end of this century,and that would last for at least acentury more.??
??According to the first two paragraphs, theauthor thinks that _________?
A.strong measures have been taken by the government to prevent global warming
B.to reduce carbon emissions is all impossible mission
C.despite the difficulty, scientists have some options to prevent global warming
D.actions suggested by scientists will never be realized
第4题
A.鉴定货币
B.没收假币
C.鉴别货币
D.收缴假币
第5题
A.发现假币而不收缴的
B.未按照《中国人民银行货币鉴别及假币收缴、鉴定管理办法》规定收缴假币的
C.无故拒绝受理收缴单位或者被收缴人提出的货币真伪鉴定申请的
D.不当保管、截留或者私自处理假币,或者使已收缴、没收的假币重新流入市场的
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