MSNBC All In With Chris Hayes September 22, 2019 00:25:00
On the planet. i traveled there to see the devastating effects first-hand. this is a glacier -- or what's left of it. the guide witnessed its retreat over the past several years. what did this glacier used to look like? >> the glacier height was the height of the mountain right there. this to me is a very big volume of water that today is in the ocean and not on land anymore. >> reporter: right. sounds very hollow almost where we're walking. >> yeah, but it's full at least 100 meters below us of ice. >> reporter: as we continued on, i got to witness climate change in realtime. that's a chunk o...