Planet in Peril: Environmental Coverage - Special Reports from CNN.com

A worldwide investigation

• Brazil: Deforestation in the rainforest
• Carteret Islands: Changing tides
• Central Africa: Water loss in Lake Chad
• China: Air pollution a major problem
• Greenland: How fast is the ice melting?
• Madagascar: Biodiversity off the African coast
• Southeast Asia: Animal sanctuary in Cambodia
• Alaska: Tracking polar bears in the Arctic
• Yellowstone National Park: Reintroducing gray wolves

How much have people contributed to the rise in the Earth's temperature?

• Natural cycle or human result?
• Little Iceland big on clean fuels
• Redford: Climate change fight needs to be grassroots
• NASA Goddard Institute for Space Studies

More than 70 species vanish from the planet every day

• Wyoming: Energy, wealth and wildlife
• Mountain gorilla killings prompt probe
• Scientists study rare whale sharks
• Threatened and endangered animals
• Polar bears on thin ice
• The Endangered Species Act

Deforestation threatens species with shrinking habitats, extinction

• Developers, ranchers encroaching on many of world's forests
• United Nations: State of the world's forests

Earth is expected to play host to more than 9 billion people by 2050

• Overpopulation could be people, planet problem
• U.S. Census Bureau: World population
• United Nations Population Fund

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About the show

"Planet in Peril" examines the environmental conflicts between growing populations and natural resources.

• Send your questions and comments to "Planet in Peril"

• Revisit the 2008 two-hour special, "Planet in Peril: Battle Lines."

Tracking wolves in Yellowstone

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Polar bears turn to cannibalism

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