We have the technology to power the world with renewables, but we’re not quite there when it comes to storing all that energy. And like the energy sources themselves, these storage technologies should be environmentally friendly and affordable. The solution: an artificial photosynthesis facility that converts solar energy directly into hydrogen, a fantastic medium for storing energy. Conventional ways of producing energy are very energy-intensive, but this process only requires the sun and some low-cost, readily available materials. See here how scientists are taking this process out of the lab and into the real world.