beavers have been too busy

A study found that the beaver is playing an increasing part in climate change because the dams they build for shelter create shallow, stagnant ponds of water which allow biological material to build up on the bottom of the river.

The production of methane is accelerated because stationary pools of water contain much less oxygen than a flowing river interacting with the atmosphere and microbes thrive in low-oxygen environments.

The study, by the University of Saskatchewan in Canada, estimates that beavers are indirectly producing 200 times more methane today than they were in 1900, when fur hunting had largely wiped out the populations in North American, Europe and Asia.

The Independent, 17 Dec 2014