Over the past 30 years, about 27 percent of the sea ice in the Arctic has melted. This is of concern because the Alaskan polar bear mothers give birth in dens on the floating ice. But because this ice is melting they are moving their dens to land, but the

Because of global warming, the Arctic ice is melting and the polar bears who usually give birth on the thick ice, are now moving to land to give birth.