http://www.slate.com/articles/business/the_juice/2015/08/biogas_methane_natural_gas_flares_u_s_industry_wastes_tons_of_gas_by_burning.html

What if we just stopped wasting, pissing away, burning, and flushing precious resources? Wouldn’t that contribute significantly to sustainability? The early returns from California’s belated response to its water crisis show that great leaps in conservation are possible with comparatively little upfront investment—and without killing the economy or immiserating residents unduly. In July, city-dwelling Californians used 31 percent less water than they did in July 2013, exceeding the 25 percent reduction target the state had set.