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« Jeff Sachs has the Millennium Villages. He spends $2.5 million in one village. It's an absolutely ridiculous model, because I've said that if you gave me $2.5 million, I can train 100 grandmothers, solar electrify 100 villages - 10,000 houses - and save you 100,000 litres of kerosene. »

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Background photo by Giuliana