Niall McCann talks to elephant biologist Joyce Poole about her career studying elephant communication and a lifetime of research in east Africa.

Niall McCann talks to Jenny Desmond - a conservationist and wildlife activist. Jenny & her husband Jimmy run a sanctuary for rescue Chimpanzees in Liberia, west Africa - they have dedicated their lives to the rehabilitation of humankind's closest relative.

Visit the Maasai savannah of Kenya, Africa's largest slum and its newest hydroelectric dam. Journey into the coal mines and power plants of growing Vietnam. Cross Nepal with an environmental health scientist, studying people's transition from the most dangerous cooking fuel, killing millions a year, to the safest. And bring solar electricity, for the first time ever, to the Arhuaco people of Northern Colombia. Watch this 7-part series, based on and expanded from the celebrated global energy documentary Switch On– a spectacular, unexpected journey to know and understand the issues driving energy development around the world.