From the disappearance of frogs in the cloud forests, to the bleaching of coral reefs, scientists say global warming is already affecting plants and animals around the world. And the world's parks and protected areas are not immune to the effects. As temperatures rise and habitats shift, can parks be managed to mitigate the effects of climate change? Ira Flatow and guests talk about it this hour.

Plus, this week, which began with the massacre at Virginia Tech, also marks the anniversaries of the shootings at Columbine and the bombing in Oklahoma City. In this hour, we'll talk with two psychologists about the mind of the mass murderer. Can knowing more about the people who commit these acts help us prevent future violence?

Call in with your questions and comments at 1-800-989-8255 (3-4 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Lee Hannah
Senior Research Scientist
Center for Applied Biodiversity Science
Conservation International
Arlington, Virginia

Lisa Graumlich
Director, School of Natural Resources
University of Arizona
Tucson, Arizona

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J. Reid Meloy
Forensic Psychologist
Clinical Professor of Psychiatry
University of California San Diego
San Diego, California

Frank Ochberg
Clinical Professor of Psychiatry
Michigan State University
East Lansing, Michigan

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This segment produced by Annette Heist