Sewage treatment plants accumulate almost 1 kilogram (2.2 pounds) of phosphate a year per resident.Landfill - the strip mines of the future. Inadequate for large scale use perhaps, but if you take a long enough view, even the Phosphorus in the oceans will eventually come back when sedimentation traps it and creates new veins of ore.
In today's sewage treatment plants, the phosphates end up in the sludge, which is then heated in mono-combustion plants and is often buried in landfills as ash or baked into concrete -- together with its valuable fertilizer component.
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Two recent(ish) books on the subject of deep time that might be interesting, in different ways. First, in SF, Alastair Reynold's House of Suns is a great deep time story from the author who does deep time better than anyone else. And in nonfiction, Zalasiewicz's Earth After Us examines what traces our civilization will leave in 100 million years.
posted by blahblahblah at 8:16 PM on January 4, 2015 [10 favorites]