Alan Titchmarsh travels Britain to discover why our islands are so diverse and extreme. He explores a time when industry changed the landscape.

Rageh Omaar goes on the trail of ivory poachers, smugglers and organised crime syndicates to investigate the plight of Africa's elephants. Show more

Documentary series. A look at how tea-growing cultures, bird-filled wetlands and futuristic cities jostle along China's eastern seaboard in a battle for resources. Show more

Sir David Attenborough tells the story of the discovery in Argentina of the largest animal to ever walk the earth, a new species of the plant-eating titanosaur. Show more

Documentary following Judi Dench as she explores the lives of trees, discovering how they feel, how they communicate and how they fight off invading armies and extreme weather. Show more