British primatologist Jane Goodall sent a letter to every U.S. senator on Tuesday urging them to oppose a push in the U.S. Congress to allow oil drilling in Alaska's Arctic National Wildlife Refuge, a region environmentalists say is one of the world's last paradises.

The Republican-led Senate is trying to open up the 1002 region on the coastal plain of the ANWR, a region inhabited by Gwich'in natives, caribou herds, polar bears and millions of birds that migrate to six of the world's seven continents.

"If we violate the Arctic Refuge by extracting the oil beneath the land, this will have devastating impact for the Gwich'in people for they depend on the caribou herds to sustain their traditional way of life," Goodall said in the letter, a copy of which was seen by Reuters.