In this segment, we learn about the role weather plays in the creation of rock formations in the national parks of the United States.

Watch some coverage of the People's Climate March that was timed to coincide with the UN Climate Summit in New York City. The march was attended by 400,000 people.

Geysers represent a very popular tourist attraction in Yellowstone Park. How do they work and where do they come from? And what is sandstone? The video answers these questions.

Why are some rock formations and animals found on more than one continent? The explanation dates back to the Ice Age.

Why do some of the national parks in the United States resemble the European Alps? Geologist Dr. Robert Darga answers this question.

Here's the trailer for an inspiring film about the efforts of ordinary people to make the world a more sustainable place. Experts talk about the necessity of taking action.

Plastic pollution poses one of the biggest known threats to the ocean and all related ecosystems. Pollution comes in many forms, and agriculture is one important key to bringing about necessary change. All of us are key players, since we all eat food.

UNICEF Goodwill Ambassador Katy Perry delivers a special weather report on the devastating effects of climate change for the world’s children.

Greentraveller's Richard Hammond shows you some of the loveliest and greenest spots in London, and gives some tips for navigating through the city.

Wild Sharks, a film by Sigurd Tesche, follows Professor Samuel Gruber who has been researching sharks for more than fifty years. He founded the Bimini Biological Field Station, called the Sharklab, on Bimini Island in the Bahamas.

peta2: At only 16 years old, Tia Blanco is already one of the top women surfers in the world. Learn how her vegan diet has helped Tia surf her way to the top!

Learn about the role of the sea in global warming. The global conveyer belt is part of the large-scale ocean circulation that is driven by differences in the density of the ocean waters. It plays a key role in keeping the climate in balance and Europe warm. Global warming may change it forever with unforeseeable consequences.
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