Dams emit billion tonnes of greenhouse gases per year: Study
According to a US-based study, hydroelectric dams emit about a billion tonnes of greenhouse gases every year, contributing to nearly 25% more methane than previously estimated. The rotting vegetation due to dams account for about 1.3% of human-caused global emissions, the study added. Notably, methane contributes almost three-fold more to global warming than carbon dioxide over a 20-year course.