Absorbing the large quantities of carbon dioxide and other greenhouse gases present in cities would require millions of tons of some naturally occurring substance. Urine could be the reactive agent. As a resource available across all human societies, it is produced in large quantities and is close to the pollution hubs of large cities.![][1]
[1]: http://feeds.feedburner.com/~r/sciencedaily/earth_climate/recycling_and_waste/~4/3fip6m0bdQM
URL: http://feeds.sciencedaily.com/~r/sciencedaily/earth_climate/recycling_and_waste/~3/3fip6m0bdQM/120817135410.htm
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