90 Earth Day 2007: Home Exchange; Hot Planet; Vanishing Places

For this year's Earth Day observance, we're getting close to some of the cool creatures on our hot planet. Rick meets Marty Essen, whose adventures to the far corners of the planet with his wife and love of sometimes-frightening critters were enough to fill a very engaging book. Rick also learns how to conduct a home exchange, and discusses the World Monuments Fund list of "Vanishing Places" with author Michael Shapiro.