Vritet një ari polar në Kanada

A handout photo made available on July 17, 2020 by Polar Bears International shows a polar bear standing on melting sea ice in Svalbard, Norway, in 2013. Climate change is starving polar bears into extinction, according to research published on July 20, 2020 that predicts the apex carnivores could all but disappear within the span of a human lifetime. In some regions they are already caught in a vicious downward spiral, with shrinking sea ice cutting short the time bears have for hunting seals, while dwindling body weight undermines their chances of surviving Arctic winters without food, scientists reported in Nature Climate Change. The study calculates "timelines of risk" for different polar bear demographics, exploring two alternative futures with different levels of greenhouse gas emissions and atmospheric concentrations of CO2. If business-as-usual greenhouse gas emissions continue, it’s likely that all but a few polar bear populations will collapse by 2100. - RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Polar Bears International / Kt MILLER" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS / AFP / POLAR BEARS INTERNATIONAL / POLAR BEARS INTERNATIONAL / POLAR BEARS INTERNATIONAL / POLAR BEARS INTERNATIONAL / Kt MILLER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Polar Bears International / Kt MILLER" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS