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Source: NRDC: Climate Change, Water and Risk http://www.nrdc.org/globalwarming/watersustainability/ Source: NRDC: Climate Change, Water and Risk http://www.nrdc.org/globalwarming/watersustainability/ In the US, 52,620,000 metric tons of CO2 – the equivalent to the amount generated by 10 million cars – is released each year by water treatment facilities (US EPA 2010). www.oasisdesign.net/greywater/index.htm