The problem with saltwater is all that salt. Californians have faced a lot of issues with adequate supplies of freshwater lately. Even though we’ve been able to stay on top of our water issues (thanks to an overly wet winter!), wouldn’t it be nice if we could use some of that massive quantity of salty water to the west of us? The problem with desalinating ocean water is that it is inefficient. At least that used to be the problem until last October, when researchers opened up a massive tomato farm in an Australian desert that is fueled by nothing but solar power and saltwater.