科学美国人60秒:资源回收是否真的有效-托福听力下载

　　科学美国人60秒中文翻译：

　　At Brooklyn's recycling depot, discarded metal and plastic gets bulldozed into a large mound. 在布鲁克林的回收站，废弃的金属和塑料如土堆般堆放。

　　The stuff is then scooped onto the first of a series of rising conveyor belts, 稍后这些垃圾会被送往一系列传送带的第一条，

　　from which the trash is sorted through means both mechanical and manual. 按照机械和手工进行分类后再经由一系列传送带回收利用。

　　All that effort produces a variety of salable products, from metals to paper fibers. 人们付出如此多努力生产出从金属到纸纤维各种各样的畅销产品。

　　But is it worth it? 但这样做真的值得吗?

　　In the case of an aluminum can the answer is an unqualified yes. 如果说是铝罐制造答案绝对是肯定的。

　　Such a can can be recycled endlessly with no loss of quality. 因为这样的罐子可以无限循环使用且质量上不会造成损失。

　　And recycling a can uses less than five percent of the energy that it takes to refine bauxite ore into fresh aluminum. 并且回收一个罐子比提炼铝土矿获得铝所消耗能源的5%还要少。

　　Recycling is worth it when it comes to all metals, though we're better at recycling aluminum than say neodymium. 所有的金属回收都是值得的，尽管相比钕在回收铝方面我们更为拿手。

　　In principle it could work for plastic, too. 原则上塑料也适用于回收。

　　But because plastic is made from petrochemicals, 但由于塑料是石油化工所制造的产品，

　　low oil prices can make it cheaper to just dump old plastic and manufacture new. 低廉的油价使得直接丢掉旧塑料，再造新的更为便宜。

　　And plastics degrade as they're recycled, as does paper. 而塑料回收后就会贬值，纸张也是如此。

　　That said, a simple cost-benefit analysis 即是说，简单的成本效益分析

　　does not correctly measure the environmental costs of dumping plastics or cutting down more trees for paper products. 并不能正确地衡量倾倒塑料或砍伐更多树木制造纸制产品所造成的环境成本。

　　The EPA suggests that recycling in the U.S.reduces the same amount of greenhouse gas pollution 而美国环保署指出美国回收资源减少的温室气体排放

　　as taking more than 38 million cars off the road. 等同于抑制3800多万辆汽车上路。

　　The sound of recycling may prove music to the ears of future generations. 资源回收这个话题在未来几代人眼中可能就像音乐一样。

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