desalination

Sundrop Farm, a 20-hectare site near Port Augusta in the South Australian desert, is "the first agricultural system of its kind in the world and uses no soil, pesticides, fossil fuels or groundwater," says New Scientist. The farm runs on solar-generated electricity and desalinates seawater that is piped 5.5 km to the farm, which the news site says "might be the face of farming in the future."

With the largest reverse-osmosis desalination plant in the world, Israel is now the only country in the Middle East to have a water surplus, says Ensia. But if other countries take Israel's cue, all that extra water could mean less fighting.

Engineers from Murdoch University in Australia hope to build a prototype "bubble greenhouse" that could be used in arid areas as a low-tech way to turn saltwater into fresh water and grow food, says SciDevNet, a website devoted to international development.