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if we capture our urine--like has been done in China (both recently and historically)--and use it as fertilizer instead of petro-chemicals we could be saving huge amounts of carbon emissions.
In fact, the video purports (I say 'purports' because it's not specified how the following figure is derived, though I have no immediate reason to doubt it) that we'd essentially offset half of all the world's airline carbon emissions, if urine collection for fertilizer was done widely.
US researchers have developed an efficient way of producing hydrogen from urine - a feat that could not only fuel the cars of the future, but could also help clean up municipal wastewater.
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