Climate change driving human encounters with polar bears

An attack by polar bears on a worker at a remote defense installation in northern Canada this month highlights the growing problem of vanishing ice in the region, and its impact on polar bears who hunt seals from atop ice floes. Host Carolyn Beeler speaks with Andrew Derocher, professor of biological sciences at the University of Alberta in Edmonton, about the impact of a warming Earth on polar bears' habitats and their interactions with humans.