A report published late last year found that global temperatures are nearing dire levels, affecting the habitat and the wellbeing of humans and wildlife alike.

Birds often are affected first.

Coming up on All Sides, the spring migration ahead and how a changing climate may affect America's favorite pastime of birding.

Guests:
Dr. Bernard Master, retired physician, businessman and internationally recognized conservationist, author of "No Finish Line: Discovering the World's Secrets One Bird at a Time"