National Geographic News

Grazing musk-oxen and caribou may help protect the fragile Arctic ecosystem from the effects of global warming, according to a new study.

Large grazers could help the region by feasting on woody shrubs and plants that would otherwise take over as temperatures rise and change the way the Arctic looks and functions.

If shrubs dominated, they would darken Arctic lands and absorb more heat from the sun, enhancing warming due to greenhouse gases.