Inter Press Service: Ringed seals in the Baltic Sea are finding fewer and fewer ice caves in which to raise their young. Rising global temperatures are the problem, and in turn are depleting the main food source of the giant polar bear, say scientists. Ever since the film “An Inconvenient Truth” showed a polar bear swimming towards a solitary and fragile ice floe, the endangered species has become a symbol of the consequences of climate change. That scene from the documentary film that made former …