Global water usage is growing twice as fast as the population. That’s a problem. There’s, of course, a lot of salt water in the oceans and most people live near coasts. So, can desalination provide an answer to the shortage of drinking water? Desalination is not new. The Romans made drinking water from sea water two thousand years ago. Modern techniques are energy intensive. But innovation is providing new solutions and the sea may very well hold the answer to the emerging water crisis.