Africa - home to the greatest wildlife gatherings on Earth. But even in this land of plenty, wildlife faces huge challenges, from Africa's rich Serengeti to Africa's. For millennia, Africa's unique wildlife has managed to thrive, even in its most hostile corners, but today its greatest threat comes from human activity. The decisions we make now will decide the future of animals, humanity and all life on Earth.

More than any other continent, North America is defined by extreme weather and seasonal change. For animals that live here this poses great challenges, but for those with a pioneering spirit it can also offer great rewards.

Sir David Attenborough explores the continent of Europe - a crowded continent transformed by mankind. From the rare and elusive wolves to the almost-extinct Iberian lynx, this continent needs protection to ensure a future for its wildlife.

Join Martin Bester for an exclusive insight into the world of BBC Earth’s new program, “Seven Worlds One Planet.” This week, Martin gives you an inside peak on what to expect from the Australia episode, including exclusive interviews and snippets from the show! Australia, a land cast adrift at the time of the dinosaurs. Isolated for millions of years, the weird and wonderful animals marooned here are like nowhere else on Earth.

This week, Martin Bester looks forward to the second episode of BBC Earth’s “Seven Worlds One Planet,” focused on Asia. The biggest continent on Earth, Martin looks into highlights including Walruses, Polar Bears, monkeys and a snake! Photo credit: BBC Studios

In Episode 1, Martin Bester is joined by Executive Producer of Seven Worlds One Planet, Jonny Keeling. They discuss some of the highlights of the show, and what to expect during this season. Martin and Jonny look forward to the first episode, "Antarctica". Photo credit: BBC Studios