The gradually increase in temperature melts the polar ice caps which eventually rises the sea level. This melting process also affects the ice shelves and ice floes which is the nursery of polar bears.
The fatal combination of global warming, melting ice caps, hunting of polar bears, lack of ice flows etc brings curse on the different vulnerable species of polar bears which is on the verge of extinct and also the prime factor behind the declines in the population of polar bears. Moreover, researchers disclosed the fact that due to the effect of global warming the population of polar bears declines at the rate of 30% in the next 35 to 50 years (Harden, 2005).
Harden, Blaine (July 9, 2005). Global warming threatens polar bears. Retrieved July 29,2009, from http://www.theage.com.au/news/world/global-warming-threatens- polar-bears/2005/07/08/1120704551713.html