There's been some bad news for the Great Barrier Reef, with experts declaring another mass bleaching—the fifth in just eight years. We find out what coral bleaching is and how it's impacting Australia's World Heritage-listed wonder.

The BBC looks at a new and innovative renewable energy invention, Kite Power Solutions. It is estimated that 30 kites could provide electricity for 75,000 homes.

People are increasingly interested in seeing animals in natural settings, so traditional jail-like zoos are giving way to open-plan zoos, and to eco-tourism.

Barbary macaques are among the most popular tourist attractions in Gibraltar. The apes have a taste for junk food, which enables tourists to see them up close and allows scientists to easily capture them for research.

We leave the macaques in Gibraltar to travel to the Galapagos Islands to learn about marine and land iguanas.

The segment focuses on the alien striped iguanas of the Galapagos Islands, albinism in a variety of animals, and the peppered moth.

The last segment focuses on Australia. We visit the Warrawong Earth Sanctuary, where there are breeding programs to reintroduce such indigenous animals as bandicoots and quolls, creatures that came close to extinction.

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

The BBC reports on a floating wind turbine that could help provide power to remote communities. This helium-filled device is known as "the bat."

Arctic sea ice is a key component of our global climate system. Scientists have observed that our polar ice is melting at an alarming rate. Dire consequences may ensue for man, beast and our planet as a whole, if we don’t move to alternative non-fossil sources of energy. View this informative video from Greenpeace.

In the coastal town of Laguna, Brazil, a strong bond has formed between wild dolphins and local fishermen over generations. The dolphins herd schools of fish towards the shoreline and then give distinct signals telling the fishermen when to cast their nets.

At a privately-owned wildlife park in South Africa, Or Lazmi has integrated herself into a group of four lions. Having known her since they were cubs, the lions treat her as a dominant figure and allow her to get extremely close.

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.

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.

The woodpeckers have cleverly used a pine tree to hide the acorns they collect, and are very good at working together. They must simultaneously keep a lookout for predators and guard their wealth from other animals keen to pilfer an easy meal!