This cave in Canada remains frozen every summer—and it's been frozen since the last Ice Age 10,000 years ago. What can it tell us about Earth's future climate?

Stream "Polar Extremes" online to learn more: https://www.pbs.org/wgbh/nova/video/polar-extremes/

PRODUCTION CREDITS Polar Extremes Director: Lucy Haken Assistant Producer: Sacha Thorpe

Digital Production: Angelica Coleman

© WGBH Educational Foundation 2020