Tourists meet Tortoise.

Photo by adactio: "A Pacific oyster from Whitstable about to consumed on Brighton seafront."

Oysters worldwide have been faring badly. From pollution levels in filthy bays to now a massive oil spill in the Gulf of Mexico, the populations of the popular shellfish have been hit hard.

Photo by Suthep Kritsanavarin

A hydropower dam project planned for the lower Mekong River is getting greater attention from conservationists as it nears the final stages of an approval process.

The Galapagos Islands are among the most stunning places on earth. The unparalleled biodiversity and spectacular wildlife makes it a travel destination the world over. But it's also in big trouble.

Photo: White rhinoceros (Digital Vision)

How far would you go to stop rhino poaching?

The Asiatic cheetah once ruled that plains in India and the Middle East, but now its population is estimated to be 100 individuals or less.

Photo via Boston

In 1969, an oil spill off the coast of Santa Barbara, California released a few million gallons of oil into marine ecosystems -- eight months later, it was among the primary catalysts for the biggest pro-environmental movement in the nation's history, starting with the first Earth Day.

Image credit: frederic.salein/Flickr

The biodiversity of Cameroon, in central and western Africa, has gotten smaller by two species.

Image credit: AP Photo/Matt Sayles

The visually stunning movie Avatar dominated the box office earlier this year and sparked conversations about everything from the environmental movement to climate

Photo via Camp Trinity on the Bar 717 Ranch

There's nothing like a week or two at sleep-away camp to get your kids off the couch, away from the Wi-Fi, and detached from their cell phones in favor of hiking, swimming, and exploring the great outdoors.