Our show will focus on hauntingly beautiful Wrangel Island, where the last known woolly mammoths roamed, and where the first impacts of global warming can already be seen. Tom Brokaw and a team of four world-class scientists will travel to Wrangel Island in July, 2007, aboard the icebreaker Kapitan Khlebnikov, to see the effects of global warming firsthand. There are a few spaces available for passengers who want to participate in this historic adventure. Two of the study leaders, Dr. Ross MacPhee of the American Museum of Natural History, and Dr. John Harte of the University of California, Berkeley, will be available on the show to answer your questions about global warming, Wrangel Island, the extinction of woolly mammoths, and the future of humankind. You'll also find out how you can participate in the upcoming Symposium on Global Warming and Climate Change.Call in to 1 (646) 652-2542 on Tuesday, February 27, 2007, at 7 p.m. Eastern time or 4 p.m. Pacific time to find out: