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COVER Recycling aluminum cans (shown here in bales at a facility in Philadelphia, PA) is just one of the many approaches directed toward doing something productive with the world's ever-expanding stream of waste. In the special section Working with Waste (page 662), we survey multifaceted efforts to tackle this global challenge. For the story behind the cover, go to http://scim.ag/cov6095. Photo: Huguette Roe, www.hroephoto.com ! b9 D; @# o# _! M, Z l" F
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发表于 2012-8-10 20:24
发表于 2012-8-10 21:45
