In "100 Heartbeats," the second premiere in MSNBC's landmark Future Earth series, famed naturalist Jeff Corwin tells the story of the "Sixth Extinction" — caused by people and which can only be stopped by people. Keep checking futureearth.msnbc.com for information about the next premiere, "Future Earth: 2025," which will air on Dec. 20. You can catch "100 Heartbeats" on MSNBC again on Thanksgiving at 11 a.m. ET.
What has been a cause of breeding problems in captive cheetahs? What effect does global warming have on coral? Test your iCue here!
Read the introduction to Jeff Corwin's book here.
See images from Save Our Seas, a foundation whose goal is protection and preservation of the global marine environment.
Learn what you can do to keep some of the planet’s most precious creatures thriving.
Rebounding from 17 in 1980 to 100 today, the red wolves are a story of hope. Naturalist Jeff Corwin has their inspiring tale.
Corwin travels to Indonesia to swim with hawksbill turtles and show the dangers they are facing in the oceans they live.
Corwin has a rare encounter with a tiger in Cambodia and works with local vets to discover what is causing their decline.
Corwin uncovers the illegal trade of pangolins and yellow-headed temple turtles in Cambodia.
Corwin meets Chhouk, an elephant in Cambodia who was snared by a poacher, and the conservationists who have helped him walk again.
Corwin visits Sumatra to profile critically endangered orangutans.
Corwin visits Cambodia to look at illegal logging and what it is doing to the rainforests and the endangered animals there.
Order the special edition DVD of the first part, "Future Earth: Journey to the End of the World," filled with bonus extras.
See the mission as experienced by two Siberian huskies with the crew, Zagrey and Tiksi.
Grant Redvers describes how humans thaw out after being exposed to extreme cold.
April 6: The collapse of an ice bridge at the South Pole and record thinning of Arctic ice at the North Pole, indicate the global climate is warming faster than thought, and prompts international calls for action.
What is the leading cause of the declining penguin population? How much has the temperature of Antarctica changed over the past 50 years? Take our quiz to test your knowledge of environmental issues.
April 22, 2008: On Earth Day 2008, NBC News anchor Tom Brokaw recounts the history of Earth Day.
April 22, 1970: During the first Earth Week, Sen. Gaylord Nelson, co-founder of Earth Day, joins answer questions from college students.
Oct. 12, 1988: Admiral Robert Peary's long-time claim to be the first person to reach the North Pole, in 1909, is questioned in 1988.
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