climate change & polar bears

Everyone knows that polar bears have become the 'poster child' for climate change. How can the largest predator on land, who survives harsh extremes be so vulnerable to a changing arctic?

Here's an introductory video piece I did with photojournalist Rob Collett in 2015 when we both worked for KARE-TV at the time:

https://www.youtube.com/watch?v=m9w4x_S3WlE