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Paths to sustainable power / Jeffrey D. Sachs, Project Syndicate, 28/03/2013http://www.project-syndicate.org/commentary/building-a-twenty-first-century-global-energy-system-by-jeffrey-d--sachsThe surest bet on the future of energy is the need for low-carbon energy supplies. Around 80% of the world’s primary energy today is carbon based: coal, oil, and gas. We will need to shift to no- or low-carbon energy by mid-century. The big questions are how and when...