Nenets children rest in a Nenets' traditional tent on the Yamal peninsula, north of the polar circle, in this August 4, 2009 file photo. The snows were late in coming on the Arctic Yamal peninsula where moist, dark permafrost entombed for 10,000 years crumbles into the sea at the top of the world. Western scientists and environmentalists say collapsed river banks, rising tide waters and warmer winters in northwest Russia are clear signs of climate change, but they add Russia is in denial, ignoring a potentially disastrous "methane bomb". Picture taken August 4, 2009. REUTERS/Denis Sinyakov (RUSSIA - Tags: ENVIRONMENT SOCIETY)
REUTERS/DENIS SINYAKOV