As a result of climate change, pollution and habitat destruction, many of our planet's wild species are on the brink of extinction. Biologist Jeff Corwin works to spread the word about the conservation of endangered species and ecosystems around the globe. Corwin is an Emmy-winning producer who has hosted numerous TV series on the Discovery Network, Animal Planet, The Travel Channel, Food Network and NBC. He is the author of 100 Heartbeats: A Journey to Meet Our Planet's Endangered Animals and the Heroes Working to Save Them, and the host of 100 Heartbeats documentary for NBC.