When battle is done, the exhausted bighorns make their way to the canyon rim. But they must be wary, as the canyon is also home to large predators, and a fierce mountain lion is on the prowl. The awe-inspiring vastness of the Grand Canyon attracts numerous tourists, but many will go no further than the lookout points due to the challenging terrain.

There are few places on Earth as breathtakingly spectacular as the Grand Canyon. One of the last great American wildernesses to be charted and explored, this mile deep rift in the landscape has been designated a national park. Among the wildlife to dwell in this remote and often harsh environment are the sure-footed, hard-headed, and sometimes quarrelsome bighorn sheep.

Every tourist that visits the Great Barrier Reef contributes in a small way to the protection of this vast and remote wilderness. We are encouraged to experience for ourselves the wonders of this unique underwater ecosystem, and come away with a deeper understanding.

The Great Barrier Reef: it’s one of the most iconic, most beautiful and most diverse locations on earth. Stretching from Cape York in northernmost Queensland down to Bundaberg on the central coast, this enormous living organism (the world’s largest) is nothing short of breathtaking.

Strict water restrictions come into force for millions of people in California as the US west coast continues to experience a crippling drought.

The group makes a plan to spread word of the Inuit's plight, but there's already a tense situation building, as hungry polar bears enter the village in search of food.

Debbie takes the young reporters along on a hunting trip and shows them one of the last remaining areas for wildlife. We hear more about the strain that a changing climate is placing on these remote and traditional communities.

When a message arrives from an Inuit correspondent, a small team sets off to investigate the environmental changes that threaten the delicate balance of life in the frozen north.

The Gulf Stream plays a big part in maintaining the temperatures we are used to, and Maestro explains that if it is interrupted, parts of the world could become colder as an unexpected result of global warming.

Maestro speaks about the Earth’s atmosphere, and explains how the greenhouse effect is changing the planet’s ability to regulate its own temperature. The kids want to know what is being done about the problem, and what the outcome might be.

It’s very warm for November, and the kids are playing outside. They’re convinced that the greenhouse effect is responsible for the unusual weather, and think it could make a good subject for the next issue of their newspaper.

The kids are frustrated with how slow things seem to be progressing, but Maestro boosts their enthusiasm with some good news: Their search for a workspace is over, and a new environmental movement is born — The Guardians of the Planet!

Maestro takes the kids across the world to show them what is being done to deal with the worst issues related to waste and pollution.

Traveling aboard the flying globe that Maestro himself has invented, the young environmentalists set out to see the situation in other parts of the world up close.

Maestro shows what can happen at conferences on the environment, where the blame is passed from person to person and little is resolved. But he also sees the necessity of paying attention to such issues, and encourages the kids to continue with their own plans to promote change.