At the southern tip of Africa, where two oceans collide, the flat-topped Table Mountain stands guard over a diverse metropolis of cultures and people. Take flight over the Western Cape and discover the breathtaking wonder of this province from above.
Our planet was once populated by megafauna, big top-of-the-food-chain predators that played their part in balancing our ecosystems. When those megafauna disappear, the result is a "trophic cascade," where every part of the ecosystem reacts to the loss. How can we stay in balance? George Monbiot suggests rewilding: putting wolves, lions and other predators back on top -- with surprising results.
Across our planet, there are a handful of places that truly astonish, like Mount Everest, the Grand Canyon and Victoria Falls. These wonders seem to have little in common other than - literally - taking your breath away. But they share one other thing: they pose extraordinary challenges for their inhabitants. The first of two programmes in which cameras explore some of the most inhospitable places on the planet and the people who live there, including a team of Sherpa roping a route on Mount Everest's notorious Khumbu Icefall and, on the slopes of Mount Kilimanjaro, farmers fight pitched battles to save their crops from marauding elephants. In the Amazon rainforest, two boys undergo a rite of passage involving hundreds of ants with the most painful stings on Earth, and conservationists in the Grand Canyon try to ensure the survival of one of America's few surviving condor chicks.
Bill Turnbull investigates one of the biggest mysteries in the British countryside: what is killing our bees. It is a question that generates huge controversy. Changes in the weather, pesticides and even a deadly virus have all all been blamed. It is a question that Bill is all too familiar with as a beekeeper himself. He meets the scientists who are fitting minute radar transponders on to bees to try to find answers.
Antarctica - the coldest, windiest, most hostile continent. Only the toughest can survive here. From Weddell seals that grind back the ice with their teeth, to colourful starfish carpeting the seabed beneath the ice. Huge colonies of king penguins crowd any ice-free land, and four tonne elephant seals fight for territory on the beach. Life comes here because the ocean that surrounds the continent is incredibly rich. Thousands of penguins, seals, albatross, and over a hundred great whales feast on krill baitballs. However, the ocean here is warming and with that comes an uncertain future. (Number of days filming: 236)
In this final episode we complete our journey, travelling back from the March equinox to the end of June. Kate Humble is in the Arctic at a place where spring arrives with a bang, whilst Helen Czerski chases a tornado to show how the earth's angle of tilt creates the most extreme weather on earth.