Imagine a zero-emission fuel that can be squeezed out of polluted water using a process powered by renewable energy. We may be closer to this reality than you think. The company HyperSolar just completed the prototype phase for a new solar-powered system it says can “split” hydrogen — that’s the zero-emission fuel — from dirty water, leaving cleaner water behind. If you’re new to the water-splitting topic this may sound a bit gimmicky, but it’s for…