Access to energy is vital for our economies, but energy is one of the main sources of the greenhouse gas emissions putting our climate at risk. It follows that we need to transition to a low-carbon, renewable energy mix. That aspiration is frequently debated -- at times encouraged, often mocked -- but it bears emphasizing: the energy revolution is already underway. Greenpeace, the German Space Agency (DLR), and the European Renewable Energy Council -- representing over 400,000 renewable energy workers -- joined forces back in 2007 and have since published more than 40 global, regional, and national Energy [R]evolution scenarios. …