Environmentalist Philippe Cousteau takes us on an unforgettable journey to a land of extremes, where scientists study global warming, in one of the coldest places on earth. The Arctic Circle that rings the North Pole is known as ground zero for climate change. It's where courageous, adventurous researchers go to find out what the long-term effects of global warming could be. Cousteau travels with them, and shows us just what these scientists are up against - subzero temperatures, severe storms and even the threat of polar bear attacks. But surviving the brutal climate is just the first challenge. The very ice cap on which the scientists live and work is slowly melting beneath their feet. Just how fast is it disappearing, and what effect does that water have on ocean currents? What are the effects on marine life and weather patterns around the world? This is some of the world's most important research, done in some of the world's most extreme conditions. This, Cousteau shows us, is "Extreme Science."