Garbageand its disposaloffers a continuing challenge to scientific ingenuity. Produced in ever-increasing amounts around the world, it is being incinerated, converted into fertilizer, used as landfill, recycled into new products or dumped carelessly into rivers and seas. Still it piles up. To keep ahead of the accumulating waste, some scientists have even suggested lofting it into perpetual solar orbit or rocketing it into the sun, where it would be consumed by nuclear fires. Now two University of Washington scientists have proposed what may be a much simpler terrestrial solution: burying civilization's debris deep...
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