Verge: Bill Gates thinks the world needs an "energy miracle" to tackle climate change, and he's optimistic about our chances. The Microsoft co-founder and his wife, Melinda Gates, laid out their vision for the future today in an annual letter published by their eponymous philanthropic organization. Unlike previous letters, this year's version is geared toward teenagers, and is centered around a very childlike question: "If you could have one superpower, what would it be?" For Bill, the answer is energy;...