The human cost of coal, in photos

Steve Hawk and Ami Vitale traveled to the mountains of West Virginia, small-town Michigan, and a reservation in Nevada to match human faces and stories with the cost of coal.

Bike-powered miniature golf!

12 things you can do with a parking spot (besides parking a car)

On PARK(ing) Day, humans around the world reclaimed parking spots with miniature golf courses, Twister, pop-up chicken coops, and banana art. Check out our favorite photos.

Green slime 21

Stay out of the water: A toxic algae slideshow

As summer comes to a close, as many as 20 states have reported green slime caused by industrial agriculture in their lakes and waterways. As these photos illustrate, it's a problem that has become hard to ignore.

From muumuu to Miu Miu: Turning thrift-store rejects into cute couture (SLIDESHOW)

Watch Jillian Owens transform old doozies into fashion do's.

Rio grand: Scenes from the Earth Summit [SLIDESHOW]

The Earth Summit in Rio may be over, but just like spring break, the triumphs, tragedies, and terrible judgment calls will live on in memory. Here are some of our favorite moments captured in all their photographic glory.

A professional forager shares her secrets [SLIDESHOW]

Take a visual foraging tour with the author of the cookbook "Foraged Flavor."

Trash talk: A visual tour through the e-waste recycling process

We visit an e-waste collection center and recycling facility to follow deceased gadgets as they go through the stages of reincarnation.

Beautiful people on bikes! (Procrastination, anyone?) [SLIDESHOW]

Trying to get some work done? Banish the thought. It's National Bike Month, it's spring, and these lovely people obviously need company.

Street people: In San Francisco, humans reclaim the right-of-way [SLIDESHOW]

In the City by the Bay, when the weather is nice, people have taken to lounging, cycling, and otherwise making themselves right at home -- in the middle of the streets.