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Mr. Green digs around for the answer.

John Muir’s ascent of Grandfather Mountain

Threatened by the rise of rooftop solar, Arizona utilities try to pack a state commission with their hand-picked candidates

Sierra's 2016 rankings of the most environmentally sustainable colleges and universities in the United States

2016 is the first presidential election in 50 years during which citizens won't have the full protections of the Voting Rights Act

How campaign finance corruption undermines policies to protect the environment

A roundup of alternatives to single-use plastics

Last May, the tribe stopped a coal terminal from being built on sacred land

Two sisters use social media to draw attention to wastewater lagoons across the street from their house

A mom on vacation sees her kids thrive when they leave the city and head for the hills

Big Coal may be dying, but it's still trying to strangle clean energy in the cradle

Tips for viewing one of summer's greatest natural light shows

Fermentation is in, thanks to new research on the benefits of having a healthy gut biome

In the book Are We Smart Enough to Know How Smart Animals Are?, Frans de Waal argues that our fellow creatures deserve more credit

A lion or buffalo could easily kill you, but not as easily as we're killing them

North Carolina is worried about bathrooms. Toxic coal ash, not so much.