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发布时间：2006-07-01 08:12     点击：

　　Taxing jet fuel is banned by an international treaty dating back to 1994. Emissions from international flights have yet to be included in the Kyoto Protocol. Action at the World Summit in Johannesburg was confined to consciousness-raising stunts inviting delegates to cough up voluntarily for the planting of trees to offset planes’emissions. The rest of us, meanwhile, love our cheap air tickets and seem immune to the irony of jetting off an eco-tour on a return long-haul that produces more carbon dioxide per passenger than a few months’ motoring. 

　　True, jet engines are getting more efficient. But this will not offset the fantastic growth in passengers. And planned high-speed planes such as Boeing’s Sonic Cruiser could reverse the efficiency trend. For all these reasons, many governments, especially in Europe, now accept the need to tax jet fuel even if the industry and the powerful bodies it influences consistently block such moves. 

　　Such intransigence (不让步) looks increasingly self-serving. But in one respect the industry is right: curbing fuel consumption alone may not be the answer. In fact, to really minimize their greenhouse contributions, planes may sometimes have to do the opposite—use up more fuel by flying at lower altitude to cut out vapour trails. 

　　The aviation industry will no doubt pour cold water on this. And in truth, the benefits of curbing plane trails are not always easy to balance against the costs. Nevertheless, there are clearly circumstances in which flying lower could be the lesser of two environmental evils. Airlines and their customers should take the idea seriously. 

46. The passage chiefly talks about ________ . 

A. slumps in air travels 

B. how to fly planes at lower altitude 

C. how to solve environmental pronlems caused by planes 

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