75% covered in permafrost in 1960, and by 2060, it's projected only 5% will be covered in permafrost. how it would affect the floor and the floor and fauna, we expect major changes here and elsewhere in the arctic. >> somebody like me that lives in new york that's not affected by this, or at least you don't think you are, what can you do? >> daily choices that you make. just, light switches on and off. the political decisions that you make. how you vote. the products you decide to buy or not buy. >> and it's not only permafrost that's melting in denali. most of the glaciers are melting, too. that's a lot of melting ice. are we past the point of no return? there's only one way to find out. and that's to head up there and