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Grades 9-12

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Reefs in Crisis

Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?

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Jaguars

Because they feed on everything from monkeys and pacas to armadillos and alligators, jaguars play a key role in the rain forest ecosystem. Learn how protecting them safeguards the jungles of Belize.

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The Green Guerillas

From a humble start 25 years ago tossing seed-filled water balloons into abandoned city lots, the Green Guerillas have grown into an organization that has created and maintains 1,000 urban gardens.

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Wilderness Preservation Act

There are more than 260 distinct ecosystems in the United States. Yet only a little over half of them are in protected wilderness areas. What does it take to obtain "wilderness status"?

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St. Lucia Parrot Recovery

In the mid-1970s, only 100 of these parrots were left in the wild. Learn how an international effort more than tripled the St. Lucia parrot population in 20 years.

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Restoration of the Elwha River

In a single century, the salmon population of Washington State's Elwha River shrunk by more than 99 percent. What caused this dramatic decline, and what can be done to turn it around?

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Lake Victoria

In the world's largest tropical lake, Nile perch have eaten their way through all but one of their prey species, bringing the ecosystem close to death. But don't blame the perch—humans are at fault.

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PROFILE: Penelope Bodry-Sanders

From acting on the Broadway stage to acting on her concerns about habitat destruction in Madagascar, Penelope Bodry-Sanders has had a wide-ranging and active career.

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The Ethnobotany Reserve Project

Traditional healers are among those hurt by logging and development of the rain forest. In Central America, they've joined forces with farmers and scientists to preserve Belize's plant diversity.

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How to Calculate a Biodiversity Index

One is the riskiest number... A more diverse plant population has a better chance of adapting to changes in the environment. Learn how to quantify the biodiversity of any area.

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