The Atlantic Ocean stretches 10,000 miles, including a 90 kilometer stretch of a warm current called the Gulf Stream. The Gulf Stream propels the migration of many different animal species, creating unique feeding frenzies for the predatory whales of the Atlantic Ocean. Jellyfish, sea turtles, fish, plankton, and people are also affected by the Gulf Stream that warms Northern Europe and keeps the Arctic Ocean from freezing. Learn about the symbiotic...

In the final leg of his journey, Simon Reeve investigates the resources boom that is enriching Australia and explores where the Indian Ocean meets the South China Sea - a crucial hub of world trade.

Continuing his tour, Simon Reeve visits a Sri Lankan elephant project, meets the Tamil people, travels on a prawn trawler, and ends on the ship-breaking beaches of Chittagong, Bangladesh.

The third leg of Simon Reeve's journey is the most dangerous as he travels from the beautiful coast of Kenya to Somalia, where pirates are plaguing ships offshore, and to the war-torn capital.

Oceans cover over 70% of the Earth's surface and are the heart and lungs of our planet. They help regulate climate, feed us, and support much of the planet's biodiversity. We are placing tremendous pressure on our ocean habitats - but with most of them out of sight, how do we know when we've pushed these environments too far? This video clip features a massive new research project in western Australia that is aiming to find out.

When it comes to regulating global temperatures, forget the Amazon Rainforest. It's the oceans that really deserve the title of lungs of the planet. Their plankton provides us with oxygen. Their currents transport heat from the tropical regions to the poles, acting as an air conditioner. They absorb almost a quarter of the carbon dioxide emitted annually. But so much of what they do and exactly how they do it is still unknown. To gain a deeper understanding...

This video clip features marine biologist Rob Harcourt. He has had a lifelong love affair with the ocean and particularly what lies beneath the surface. His desire to capture what he sees in this underwater wonderland has led to an incredible collection of photographs, which he hopes will inform and inspire people more at home on solid ground.

If you're an ocean creature with a hard shell - like a sea urchin, a hermit crab, or a coral polyp - you prefer ocean water with a pH of about 8.2. This chemistry makes it easy to assemble your armor from carbon-based building blocks dissolved in the ocean. Since the beginning of the industrial age, though, the ocean has been absorbing the greenhouse gas carbon dioxide from the air. The increase in carbon dioxide has made the ocean's pH more acidic,...

In this video clip, Surfing Scientist Ruben Meerman reports on how researchers are utilizing local wildlife to find answers to questions about ocean circulation and the ocean carbon cycle.

Follows Thor Heyerdahl and his five crew members as they sail the Pacific Ocean from Peru to Polynesia by raft.