Climate change will affect Polar bears.

 http://news.bbc.co.uk/earth/hi/earth_news/newsid_8700000/8700472.stm

Polar bears live only in the northern arctic region of the planet, the region many people think of as the "North Pole". While they do not actually spend their entire lives on the ice, they depend on pack ice for their survival. Pack ice, also referred to as "ice floes", is ice which forms in arctic regions of the ocean, such as the Arctic Ocean in the north and the ocean surrounding Antarctica in the south. 

The phenomenon known as "Global Warming" is when Global Average Temperatures rise, causing the Earth to gradually become warmer; as the Earth warms, the pack ice begins to melt. Without pack ice Polar Bears have nowhere to rest when they hunt at sea, among other things, and they end up drowning because they become too tired from having to swim all the time.