Graham Zimmerman is an alpinist, filmmaker and veteran of more than 30 international climbing expeditions. In the summer of 2019, Graham was part of a team that completed the first ascent of Link Sar in the Central Pakistani Karakoram via its Southeast Face. (It was a highly coveted prize; nine unsuccessful attempts had been made throughout the years.) Graham was born in New Zealand, raised in America's Pacific Northwest, and has become, through his experiences in the great mountain ranges and glacier fields of the world, a leading voice for the climate change organization Protect Our Winters. Hal and Graham talk about how one trains mentally and physically for a brutal ascent like Link Sar, expedition planning, learning whitewater boating on the fly (in anticipation of an expedition where those skills will be a matter of life and death), adventure partnerships, and the work of the brilliant energy expert and economic historian Daniel Yergin.