A whopping 10% to 15% of the world’s energy goes toward something that, unless you’re a chemical engineer, you probably never think about: separating gasses. Most of that happens the old-fashioned way ...

Hydrogen, or H₂, is getting a lot of attention lately as governments in the U.S., Canada and Europe push to cut their greenhouse gas emissions. But what exactly is H₂, and is it really a clean power ...