Global+warming

http://www.penguins-world.com/penguins-and-global-warming.html

http://www.telegraph.co.uk/earth/earthnews/3318079/Penguins-now-threatened-by-global-warming.html

http://www.defenders.org/programs_and_policy/global_warming/wildlife_and_global_warming/penguins.php

http://news.mongabay.com/2008/0211-penguins.html

http://www.sciencedaily.com/releases/2008/03/080330215330.htm