There’s been a debate burning for years on the causes of global warming. But according to scientists, the debate is over. New evidence shows man is contributing to the warming of the planet, pumping out greenhouse gases that trap solar heat. And, they say, the North Pole, which has been frozen for 100,000 years, is in the process of melting.

Much of this new data was compiled by American scientist Bob Correll, who led a study called the Arctic Climate Impact Assessment. According to the study, the seas are rising, hurricanes will be more powerful (like Katrina) and polar bears may be headed toward extinction. So what does the melting Arctic look like?

Scott Pelley recently traveled North with Correll to see first hand. His report will air on 60 Minutes, Sunday, Feb. 19, 7PM ET/PT on CBS.