San Francisco, UNITED STATES
Scientist Eric Dimond of the San Francisco Eploratorium, cranks a desalination pump by hand to display...
Scientist Eric Dimond of the San Francisco Eploratorium, cranks a desalination pump by hand to display the process of turning salt water to fresh water at a public parklet - a space the size of two parking spots in the Mission neighborhood in San Francisco, California May 18, 2015. As the state's drought enters its fourth year, Dimond said the parklet holds exhibits on the theme of water and sustainable water use, including a desalination pump, a rain gauge, and a low-evaporation plant watering device. REUTERS/Robert Galbraith