India's emissions may be higher due to dams: India's greenhouse gas emissions could be 40 percent higher than official estimates if methane released from dams is taken into account, according to a new study. Methane -- about 23 times more powerful than carbon dioxide in terms of the amount of heat it traps -- is released from reservoirs, spillways and turbines of hydropower dams as a result of rotting carbon-containing vegetation. But India, already one of the world's top polluters, has never measured methane emissions from its 4,500 large dams and has therefore never taken it into account in official …
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