A baby is delivered via cesarean section at the Butaro Hospital in northern Rwanda. The facility is designed so that natural wind flows ventilate surgical suites, eliminating the need to burn fossil fuels to mechanically ventilate them.

With surgical care on the rise globally, researchers worry the energy-consuming procedures will have a negative impact on the climate. But they say there are ways to make them more energy-efficient.

(Image credit: William Campbell/Corbis via Getty Images)

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