It turns out that there's such a double - win in most bathrooms around the world; if we had «NoMix» toilets that separate urine from solid
waste, municipal wastewater plants would have a significantly easier task (and produce more methane to generate electricity), and we could much more easily extract
precious nutrients like phosphorus and nitrogen for use as fertilizer (instead of using fossil
fuels).
Just because we have centuries of fossil
fuels in reserve, with thorium etc in the works, doesn't mean we should
waste one
precious nugget of coal.