The people of Harriman, Tenn., woke the morning of Dec. 23, 2008, to find their community awash in a billion gallons of toxic coal sludge.

What happens two months after a major environmental disaster, when the lights go out and everyone stops paying attention?

Massive twitter campaign invites @barackobama to visit Appalachia and see mountaintop removal first hand.

Alabama county’s decision to store coal ash from the Tennessee spill fills coffers, but also spurs worries about consequences.

Tennessee Valley Authority announces plans for economic development projects in Roane County, the site of last December’s coal ash spill.

It's worth remembering that at the end of 2008, more than 1 billion gallons of toxic coal ash slurry was spilled by the Tennessee Valley Authority. When will ou

Industry and environmentalists find themselves on opposite ends of coal ash options.

Ruling is latest twist in a long debate over how to regulate and enforce coal ash disposal.

A new EPA proposal attempts to limit toxic emissions of air pollutants from coal and oil-fired power plants.

Fear of toxins unites Wayne County community against dumping of coal ash waste.

Running and walking may have similar benefits, but are there times when is walking better than running?

A new study reveals that a lean, fit body equals happy teeth and gums.

As the 'Mad Pooper' terrorizes Colorado Springs, many are asking why runners are so obsessed with poop anyhow.

Residents noticed 95-year-old Harvey Djerf struggling on his daily walks, so they came up with a kind solution.

Adding walking poles to your daily jaunt is an excellent way to boost your calorie burn, and they may even help prevent chronic pain with aging.

A study in the Lancet looked at over-60 walkers, and those who worked on a busy London street didn't fare as well as the park walkers.

Balance is tied to both strength and overall physical health, here are some exercises for any fitness level.

Your body clock influences what time of day you burn more calories.

From your heart to your head, here's why you should lace up your sneakers and walk.

Knowing how to measure metabolic equivalents is an easy way to sneak in exercise and make sure all your movements count.

New study finds several short bursts of exercise are just as effective as one long one.

Defying stereotypes, teenager Vilde Westeng aims to be the best halling dancer.

Your social network predicts your health and wellness more than your fitness tracker, study finds.

Researchers looked at walkers and runners with bent and straight arms to find out.

Everyone gets winded while climbing stairs, but sometimes it's a little more serious.

Valley fever, or coccidioidomycosis, is a potentially deadly fungal infection that has been called California's "silent epidemic."

Climatologist documents Greenland's warming conditions with a photo of sled dogs splashing in meltwater on top of sea ice.

Before clean air laws were passed in Pittsburgh, smoke left buildings in a nighttime shroud all day, yet air quality issues aren't really in the past.

Outdoor air pollution has now been classified as 'carcinogenic to humans' by the United Nations.

Many American likely aren't aware that the air in their homes and offices may be cause for concern.

Loopholes in the Montreal Protocol may need to be tightened, researchers say.

A new report from the American Lung Association finds that nearly 148 million Americans breathe unhealthy air.

Chilean soccer fans are urged do the unthinkable and kindly step away from their grills due to worsening air quality levels in Santiago.

Oregon's Silver Falls State Park is a wonderland of rivers, streams, rainforest and cascading water.

Since its release last Saturday, the film on China's crippling pollution has been viewed over 100 million times.

The WELL standard picks up where LEED and other standards fear to tread.

It's a breakthrough that scientists around the world have been pursuing for years.

Preference for "cleaner" male trees and plants in urban settings may trigger extra sneezing and wheezing. That's botanical sexism, says Thomas Ogren.

The air inside your home can be more polluted than the air outside. Want cleaner air? Here are 11 natural ways to clean your indoor air without using chemicals.

A 'capped inversion' trapped air pollutants near the ground.

Falling levels of air pollution have resulted in a drop in California's dense tule fog.

Meet 15 rare animal species whose futures could be determined — for better or worse — in 2015.

Sudan and two females of his subspecies are under constant surveillance in Kenya, but it may not be enough to save the northern white rhino from extinction.

Endemic species run a higher risk of extinction because of their geographic isolation.

This video is a good warning of the future of wildlife if populations continue to decline as Living Planet assessment reports.

Even core areas of pika habitat 'are vulnerable to climate change within a timeframe of decades,' researchers say.

Ancient 5-foot 7 penguin weighed at least 220 pounds and speared fish with its sizable beak.

The crest-tailed mulgara was once a common sight in New South Wales deserts before other predators edged it out of the habitat.

The U.S. Fish and Wildlife Service declared the eastern cougar extinct after it not being seen for over 80 years.

Can lost species ever become un-extinct? Many scientists believe it's only a matter of time before many extinct animals again walk the Earth through cloning.