Wanna dig around in that stuff.
Well, Discover reports that one million inhabitants flush $13 million worth of precious metals down toilet and sewer drains each year.
Read the story @ Sewage Sludge Is Flush With Gold and Platinum
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Actually, recovering rare resources from sewage is wise if it can be done economically.
Yes, but the sewage is actually a resource, if one can remove the toxins. But, if removed as elements, many of the toxins are actually valuable in themselves. And we will be creating more sewage constantly.
Yes that would. And it might be easier to remove the metals and such from the ash. Would not add CO2 to the atmosphere as this is cyclic CO2, already part of the carbon cycle.
How can you, supposedly a Phd Geologist, not understand the carbon cycle? It is only when we take sequestered carbon, such as coal, petroleum, or clathrates, and put it into the atmosphere, that we add to the total content.