Looking at calcium and vitamin D supplements, researchers found no difference in the health outcomes for people who took supplements and those who didn't.

As more states legalize cannabis for health treatments, here's a rundown of the science.

These storied specimens have been shortlisted for Britain's Tree of the Year contest.

Massey Energy wants to rip down Coal River Mountain in West Virginia to get at the coal below. Local residents need your help.

Ashely Judd, newly minted foe of mountaintop removal mining, will be chatting live about the evil practice in about an hour on Daily Kos.

The EPA announced a plan to tighten up rules governing the environmentally destructive practice of mountaintop removal mining.

Movie star Darryl Hannah and NASA scientist Dr. James Hansen were arrested along with dozens of others after blocking access to a coal facility.

MNN's Karl Burkart closed his Chase Bank account to protest their financial support of mountaintop removal mining. What can you do to help?

A new report from the Health Effects Institute says are breathing air that's considered unsafe by the World Health Organization.

The 'Vessel' is massive collection of stairs located in New York City's newest development — Hudson Yards.

Dubbed 'the smartest park ever built,' the Public Square and Gardens at Hudson Yards is now open for visitors.

A concept unveiled at a UN roundtable outlines a fully autonomous floating city.

The new certificate is offered by the U.S. Green Building Council's Center for Green Schools.

If it meets the goal, the Exploratorium in San Francisco will be the largest net-zero energy use museum in the nation.

In observation of one of the original New Urbanist-style planned communities' 75th anniversary, Norris, Tenn. gets a self-sufficient prefab demo home.

This California hotel that our food blogger stayed goes beyond LEED certification in its sustainability initiatives.

Calgary will be getting yet another show-stopping skyscraper, this one a LEED Platinum-exceeding mixed-use development designed by Bjarke Ingels Group.

To save energy, a newly opened LEED residence hall at Bridgewater State University outlaws the dorm room staple known as the mini-fridge.

Holst Architecture's Bud Clark Commons project joins an eclectic assortment of notable green buildings on the 2014 AIA COTE annual top 10 list.

Study measuring traces of psychotropic drugs in the air of eight major Italian cities has alarming results.

The Earth's globally-perceptible seismic 'hum' is now being used to peer into its depths, shedding new light on the planet's inner layers.

Ever wonder why mountains are as tall as they are? Why is the tallest mountain on Mars nearly 3 times higher than Mount Everest? MinuteEarth has the answer.

Researchers have managed to pinpoint the time you're most likely to meet a spider.

The rainforest as a living machine, is quite possibly the most sophisticated technology on the planet.

Two fair trade pioneers get into the carbon market.

Travel company cancels offset program citing its inability to reduce global emissions.

A 10-mile stretch of Los Angeles' 405 Freeway — the most heavily trafficked road in the country — was completely shut down this weekend as part of a $1 bill

Which form of travel gives off the fewest emissions? Let's just say it pays to carpool.

FlightCar leverages all those idle vehicles in the long-term lots, and it's a lifeline for frequent flyers.

Quant's fire-breathing electric supercar performs great — on paper. The futuristic battery tech is cool, but will it work?

Being stopped at red lights is more than just annoying; it also can be incredibly unhealthy.

Air conditioners have made architects lazy, and we've forgotten how to design houses that might work without it.

With its edible veggie walls and lack of traditional HVAC systems, Carbon Positive House aims to "free us of modern day lifelines."

There are many different types of staircases that can make your home a more efficient, safer and even a more attractive place.

With the Living Building Challenge now under its belt, the facility is being heralded as one of the greenest buildings in the world.

In rural stretches of Connecticut and Tennessee, two nature-surrounded retreats built for retirees.

Don't want to live in it anymore? Just covert it into a drive-through shaved ice stand.

Honestly, it would be a touch difficult to hit the books on a campus this wildly verdant.

Developers behind the 104-acre sustainable project in Belize promise to consider all concerns ahead of construction in 2017.

It's just like camping ... but with free WiFi and Malin + Goetz shampoo.

New high-rise called Tao Zhu Yin Yuan (“ The Retreat of Tao Zhu”) by Vincent Callebaut provides luxury housing and 'hope for a better tomorrow' in Taiwan.

Situated next to the High Line, Solar Carve Tower is specifically designed not to bogart air and natural light from its neighbors.

It's a handsome, pared-down design, but where are the wheels?

The mountain gorilla population is rebounding in the Virunga Volcanoes Region, according to census results announced by the African Wildlife Foundation.

Brazil's once-expansive Atlantic Forest has now almost completely disappeared.

Conservation efforts pay off for mountain gorillas, which have been re-classified from "critically endangered" to "endangered" by IUCN.

The rediscovery of this hibiscus relative in Hawaii illustrates the growing importance of drones in wildlife conservation.

England is poised to introduce a sweeping ban on the import of endangered animal parts, including those from "trophy" kills.

Confused about egg carton labeling? You're not alone.

Nonprofit, which monitors the health and safety of animals in the entertainment industry, calls the expose a distortion of the truth.