Prince William, David Attenborough and Shakira find out about inspiring people and projects across the world that can help us stop damaging the oceans and enable their revival.
How has a small place in northern Finland managed to become Europe's most eco-friendly town? Ii has slashed its CO2 emissions by 80% and is producing 10 times more renewable energy than it consumes. This community project could be an inspiration for us all - but such rapid change is not without opposition.
Iain travels into the stratosphere in a Cold War fighter, gets his eyebrows singed in Siberia and discovers why Argentina is one of the stormiest places on Earth. All to show why our atmosphere is unique and utterly crucial for life.
The confluence of two geological forces created and continues to build the island of Iceland. They also keep the geology active with global implications. For now the massive, but retreating, glaciers are keeping the glaciers in check.