This much CO2 hasn't filled the planet's atmosphere since the Pliocene Epoch 3 million years ago — long before modern humans existed.

Reducing the flow of the greenhouse gases that spur global warming could prevent up to 3 million premature deaths annually.

We hear a lot about carbon dioxide when we talk about climate change, but sometimes here's why too much CO2 in the atmosphere is a bad thing.

This surprising discovery won't be enough to stop climate change, but it will help, researchers say.

For several countries, the switch from coal to renewable energy is paying off in our attempt to reduce global carbon emissions — but we still have work to do.

The latest World Meteorological Organization Greenhouse Gas Bulletin paints a grim picture for our environment.

In continued efforts to track changes in glacial and sea ice, NASA's IceBridge plane has begun collecting data in Greenland.

By foraging in your backyard, you can turn a crop of cheerful but maligned dandelions into a tasty, traditional French soup.

Shipping containers can be transformed into a variety of innovative homes and hotels.

It's time to cultivate a true appreciation for what we have.

Flow, a handheld tracking device by Plume Labs, wants to help us better understand — and avoid — urban air pollution.

Over 60,000 members of the People’s Liberation Army will help increase the total acreage of forested land in China from 21 to 23 percent.

Part of the Keystone oil pipeline was shut down after a 5,000-barrel leak in South Dakota, the pipeline's operator TransCanada said.

While the Camp Fire rages over 100 miles away in the Sierra Nevada foothills, San Francisco experiences an air pollution emergency.

The Indian Supreme Court delivers a serious ultimatum to the government: clean up or tear down the ailing global architectural landmark.

Decades after the first of the iconic orange phones began washing ashore, a French community finally has answers.

Earth's atmosphere hasn't had this much CO2 in human history, and possibly not since the Pliocene Epoch about 3 million years ago.

Documentary on coal mining’s effect on Appalachian communities premieres in West Virginia this Saturday.

Federal law requires mining companies to restore strip mines to their original condition, but many don't bother.

Actress keynotes luncheon to denounce the harmful practice of mountaintop removal coal mining -- and its effects on the people of her native Kentucky.

A state legislator has an interesting and potentially viable way to avoid dealing with the EPA.

After studying under Ansel Adams, Rob Decker is creating posters of all the national parks with a nod to the WPA posters of the 1930s and '40s.

A young parkgoer returned a rock she took from Smoky Mountains National Park along with a drawing and a nice letter.

A passive solar home in Japan boasts various energy-saving features and a sloping, stair-clad roof that doubles as hangout area/lounge for (hopefully well-behav

Eco-Sense, described as North America's first code-approved, seismically engineered load-bearing insulated cob residence, is one of the first projects to gain s

Michael Pollan thanks and congratulates several organizations.

Michael Pollan explains how a variety of plants and animals make for healthy farms, which make for healthy people.

As the Senate votes to give the FDA more power, read what those in the know are saying about it.

This short video of moving vegetables explains why so much food is grown yet so many people remain food insecure.

A report issued earlier this week caused quite a stir in the organic food world. See what some respected organic food advocates are saying about it.

If organic foods can’t contain genetically modified ingredients, you’d think organic food companies wouldn’t have a problem with labeling foods that conta

Your Daily Thread — self-described as "L.A.'s hub for all things green, sustainable & local" — has been live for quite a while now, but finally threw its of

Looking to avoid a date with pesticides this Valentine's Day? Outfit your love <s>dungeon</s> den with stylish sheets and bedding made from organic cotton and o

'What are we supposed to do?' one hiker whispered as a puma stared them down in Sequoia National Park.

You have until Aug. 28 to get your lifetime National Park Service senior pass at the lower rate of $10.

The Rocky Flats National Wildlife Refuge opens to the public Sept. 15 amid controversy and concerns.

The air at 85% of national parks is unhealthy at times, report finds, building on a study that said concentration of smog-forming ozone rivals that of cities.

Whether you're planning to camp or just go for a simple hike, here are 10 things you need before you hit the trail.

Environmental Working Group's newest sunscreen guide rates the safest sunscreens and calls out bad practices (like too-high SPFs.)

Obama and Jintao announce sweeping clean energy 'cooperation plan' that could significantly reduce global greenhouse gas emissions.

Fracking for shale gas may be dangerous, but the international agency offers a list of rules it says can make the process 'environmentally acceptable.'

The Youngstown quakes were triggered by wastewater injection, scientists have discovered.

Scientists are developing robots to serve as companions to the elderly.

The Salvation Army's nonprofit grocery store, DMG Foods, has opened in Baltimore with help from the Maryland Food Bank.

We've given far too much of our lives to Facebook to give up on the relationship now.

Why are regular citizens doing the work that should be done by the companies that make the disposables?

Endurance athlete Ben Lecomte attempted to swim across the Pacific Ocean to bring attention to the state of our oceans.

A new technique promises to turn plastic waste into clean, high-grade fuel.

Republicans are licking their chops about questioning the EPA administrator, but recent history shows that may be exactly what she wants.

The American Recovery and Reinvestment Act is responsible for creating or saving one million green jobs.