Nick Hollis is an international mountaineer who's seen our impact on the natural world first-hand. He's set a world record attempt to promote environmental responsibility and raise funds for the conservation of our planet's most precious resource: its rainforests. To complete the 721 Challenge Nick will climb the Seven Summits, ski the North and South Poles and row the Atlantic Ocean in world record speed. He has already climbed the highest mountain on every continent, completing the 7 summits, now he has just two more challenges to go in this race against climate change.