The animals are getting thinner. The ice is a vital food source for the bears. Since 1979 summer ice has declined 30%. If the ice continues to melt at the current rate, 2/3 of the world’s polar bears could possibly disappear by 2050. Sea ice is important to polar bears because the surface provides them with a place to travel and hunt.
The world will grow warmer and warmer as greenhouse gases rise. Human activities are causing the current warming and related climate problems. Scientists cannot predict the first summer will Arctic be ice free unless we reduce greenhouse gas discharge. Polar bears have evolved for life on sea ice.
Plankton is eaten by small fish which are eaten by seals which are eaten by polar bears. Polar bears therefore absorb contaminants . Even young cubs carry pollution from their mother’s milk. Pollution is locked in deep freeze and as the ice melts it will continue to be released.