What Next? Cassandra Williard

Cassandra williard: The ticks are very sensitive to temperature, and there is this thought that they're going to be able to spread northward as the winters get milder up north. She says deer are implicated in all this because they are a big source of food for ticks. "It's all a bunch of complex answers about how we use the land," she says. We'll be back next week with more episodes.