What mud from glacial lakes can tell us about our history and future

While on the National Geographic 2019 Expedition to Everest, scientists traveled to Nepal's Gokyo Valley to collect sediment cores from glacial lakes. The team's mission was to gather data on the effects of climate change at the highest elevation on the planet and discover what kind of history they could find in the mud. See what challenges they faced while collecting samples at Taboche Lake in the Himalayas. Read more in "What happens when the roof of the world melts?" To learn more about the National Geographic and Rolex Perpetual Planet Extreme Expedition to Everest, visit natgeo.com/everest.