Playground-powered Water Supply

"...wouldn't it be better to just give a sizable chunk of what we in the United States spend on public water services -- to recreate, for instance, some sort of Edenic fantasies in the desert Southwest with water diverted from severely depleted sources -- to the sub-Saharan African nations to improve their hydrological infrastructure, and we are the ones who get to install the PlayPumps in our school grounds and playgrounds..."