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Solar energy, the world’s cheapest and fastest-growing power source, could one day supply most of the world’s energy needs. But in a new book, “Taming the Sun: Innovations to Harness Solar Energy and Power the Planet” (MIT Press), energy expert Varun Sivaram warns that solar’s current surge is on track to stall, dimming prospects for averting catastrophic climate change. Brightening those prospects, he argues, will require innovation—creative financing, revolutionary technologies, and flexible energy systems.