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Bill McKibben in a David-vs-Goliath battle fights the fossil fuel industry to change the terrifying math of the climate crisis.

Dan Nocera has a simple equation to save the planet: sun + water = energy for the world. Taking his cues from nature, what the father of photochemistry Giacomo Ciamician called "the guarded secret of plants", Nocera has invented an artificial leaf with a self-healing catalyst that can power the earth inexpensively by using sunlight to split water and store energy.