Canada's wildfire season returns, sparking evacuations

Canada faced a ferocious wildfire season last year. So, far this year appears to be headed on the same trajectory as communities faced evacuations and property losses in the western provinces. One trigger has been smoldering underground fires from last years blazes. They're dubbed "zombie fires." Host Carolyn Beeler speaks with Jennifer Baltzer, a forest ecologist, about the role of zombie fires and what this wildfire season could look like in Canada.