Guardian: Concerns are intensifying in the US about the troubling interdependence of the economy's water and energy needs. In particular, the vast quantities of water (about 40% of national water withdrawals) needed for cooling US power plants are making headlines, and proposals to build thirsty new generation plants in drought-stricken states like Texas are under heavy scrutiny. Hydropower is also under strain from climate change, as more and more "one in a hundred years" droughts are reducing rivers to a...