Adventurer Eric Larsen has faced some of the harshest conditions on Earth. He has been to the South Pole and the North Pole, and he stood atop Mount Everest. Traveling by ski, dogsled and bicycle, he has crossed snowy landscapes scoured by howling winds.”Worst-case scenario, the ambient temperature is minus 50 and you’re dealing with wind chills that are even colder than that,” said Larsen,