Google cofounder Larry Page is fond of saying that if you choose a harder problem to tackle, you’ll have less competition. This business philosophy has clearly worked out well for the company and led to some remarkably successful “moon shot” projects: a translation engine that knows 80 languages, self-driving cars, and the wearable computer system Google Glass, to name just a few. Starting in 2007, Google committed significant resources to tackle the world’s climate and energy problems. A few of these efforts proved very successful: Google deployed some of the mostenergy-efficient data centers in the world, purchased large amounts of renewable energy, and offset what remained ofits carbon footprint. Google’s boldest energy move was an effort known asRE