Dear Umbra, Our roof is getting pretty old and starting to fall apart. It's one of those asphalt-shingle roofs that most houses have these days. Before we call the roofing company, I'd like to know what's the greenest kind of roofing material to use. Metal? Cedar? More asphalt? I'm sure lots of other readers would like to know, too! Thanks, Wally Bubelis Seattle, Wash. Dearest Wally, Like other readers, you may need a drink or two to wade through the perplexing nexus of budgetary, aesthetic, and environmental concerns involved in making sustainable-building decisions. It sounds to me like you're looking …
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