Embedded Player Guests: Luann Becker Visiting Assistant Professor, Geology, University of Washington Seattle, Washington Roger Herrera Washington D.C. Coordinator, Arctic Power, Anchorage, Alaska Melinda Pierce Senior Washington Representative, Sierra Club, Washington, DC This week, Senate Republicans proposed a new energy bill that would open the Arctic National Wildlife Refuge for oil exploration, despite strong opposition from Democrats, environmental groups, and even some Senate Republicans. In this hour, a debate on drilling in Alaska's protected wilderness. Plus, new evidence that an asteroid or comet caused the largest mass extinction in our planet's history.