(BBC) - Dams and reservoirs around the world are an underappreciated source of methane. Now start-ups want to capture that gas as a source of power.
It takes just one second for four Olympic-sized swimming pools-worth of water to charge through the turbines at the Tucuruí dam in northern Brazil. The rush of water here at one of the largest hydroelectric reservoirs in the Amazon region is deafening, but it's what makes the dam the fifth largest power plant in the world.
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