Assignment Earth Video

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Initial studies show underwater habitats and species are recovering successfully in California's new marine protected areas.

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New discoveries reveal alarming increases in jellyfish in the oceans, and scientists suspect the causes could be overfishing and global warming.

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Wily and opportunistic, coyotes have moved steadily eastward and are now found almost everywhere in the United States.

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With an expanding network of acoustic receivers on the ocean floor, researchers track tagged animals and provide accurate data on life cycles and migrations of marine life.

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Architects and Conservationists in New York City seek building designs that are less hazardous to birds.

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Experts say climate change is one reason conflicts with black bears are increasing in California's Lake Tahoe area.

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Conservationists try to save an ancient species from declining habitat and growing threats from predators.

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Scientists warn that California's famous crystal-clear lake is seriously threatened by global warming.

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Successful ecotourism on the Osa peninsula raises new challenges.

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Under the protection of the Endangered Species Act, the recovery of America's national symbol is now hailed as a major success story.

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In the old-growth forests of the Pacific Northwest, northern spotted owls face an aggressive competitor and new plans to remove protection for their habitat.

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Biologists use new techniques to monitor the recovery of gray bat populations in protected cave habitats.

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In a vast region in arctic Alaska, wildlife conservationists and the U.S. government square off for a major battle over proposed oil and gas leasing.

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New York City is on the front line of a desperate war against a sneaky invader.

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Giant salamanders in the Ozark mountains are disappearing, and scientists are trying to find the cause.

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In northern California, global warming is apparently causing glaciers to grow, not shrink, on Mount Shasta.

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An ambitious plan for a giant wind farm project off the the coast of Cape Cod in Massachusetts has divided environmentalists and pitted residents against each other.

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In the southeastern U.S., land managers are using fire to restore ancient prairie habitat.

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With poachers threatening the survival of this insect-eating plant, marking them with dye helps to prosecute thieves.

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Volunteer pilots offer aerial views of environmental damage.

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New York City is pioneering the use of tidal flows to generate electric power.

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Flowing down the Mississippi, fertilizer runoff has a devastating effect in the Gulf of Mexico, creating a vast area devoid of life.

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In America's Southeast, growing population pressures are forcing states to compete for limited water supplies.

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After 150 years of mining and logging left a huge environmental disaster zone in southeastern Tennessee, massive cleanup efforts are showing positive results.

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Following years of civil war in southern Sudan, wildlife herds are thriving but facing new peacetime perils.

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In Florida, recovering populations of manatees still face serious threats from collisions with motorboats.

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Conservationists return black bears to Louisiana's forests where the animals haven't lived for decades.

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Large areas of Louisiana's cypress forests, critical for storm protection, are being clearcut for garden mulch.

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AJust a few dozen miles from Manhattan, bald eagles have been re-introduced and are thriving in New York's Hudson River Valley.

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After annual counts showed moose herds declining in Wyoming -- with wolves, bears and habitat quality sharing blame -- a lone researcher studies the mystery with surprising results.

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Restoring healthy flows of fresh water in dammed and polluted rivers can be monitored by tracking endangered fish with radio transmitters.

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In the southeastern United States, cave-lovers find that buying caves is one sure way to protect them.

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Ecologists try to transform ditches into natural streams needed to bring healthy hardwood forests back to the Mississippi Delta in Arkansas.

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A colorful amphibian is a celebrated symbol of a campaign to save green space in Homewood, Alabama.

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After an absence of nearly 200 years, North America's largest rodent has returned to New York City.

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Deep in an Arkansas swamp three years ago, David Luneau says he filmed a few fleeting seconds of a bird believed extinct, and he's still searching.

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A major stopover site for migrating cranes in Tennessee is threatened by high-density development plans for surrounding land.

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Last year's election results in Wyoming show many sportsmen will ignore party affilations on issues affecting conservation of public lands.

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In India, a rare crocodilian clings to survival in a river sanctuary threatened by aggressive human encroachment.

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In a river in Tennessee, field researchers brave freezing water to find and study a little-known endangered species.