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As a result of global warming there is a faster thawing of the lakes in Siberia resulting in release of larger quantities of Methane. The larger production of this greenhouse gas will then further aggravate global warming. Scientists write that

“Thaw lakes in north Siberia are known to emit methane, but the magnitude of these emissions remains uncertain,” “We show that methane flux from thaw lakes in our study region may be five times greater than previously estimated.”

The lakes are formed in summer when permafrost melts. Apart from this the other highest source for methane is farming practices.

Via: BBC News