evidence: Polar bears are set to become one of the most notable casualties of global warming unless drastic action is taken, says WWF. The impact of climate change is increasingly felt in polar regions, where summer sea ice is expected to decrease by 50–100 per cent over the next 50–100 years. Dependent upon arctic sea ice for hunting seals and highly specialized for life in the Arctic's marine environment, polar bears are predicted to suffer more than a 30 per cent population decline in the next 45 years. [...] According to a recent WWF study, a quarter of the world’s species will be on their way to extinction by 2050 as a result of accelerating climatic changes directly linked to human use of fossil fuels. The latest findings indicate that the Earth is warming faster than at any time in the last 10,000 years and climate change in the Arctic, where polar bears live, is expected to be among the greatest of any region on Earth.