and south poles as well as the top of the world's tallest mountain in a single year. eric says that he launched the save the poles expedition to focus attention on global warming and to document firsthand the changes that have taken place in some of these places. he joins us this morning via satellite phone from his base camp on everest. eric, thanks so much for joining us. >> thank you for having me. i appreciate it. >> we see the sign, hello cnn, everest base camp. what a feat to make the summit of everest this time of year. i'm sure that was quite difficult. how has it been for you as you have gone on these three adventures this year? >> well, i've spent about six months of the last year living in a tent. but i will say it's been an amazing experience. i've seen things most people will probably never ever be able to see. and really telling the story of the last great frozen places on