Rise of the Tuna

4 metres long and the weight of 2 grizzly bears. Meet the bluefin tuna, back in Britain

• 53 mins

Clean energy or green fields?

Is it possible to build new green infrastructure without wrecking the countryside?

• 52 mins

Beak and Talon

Britain's birds of prey seem to be bouncing back. Can their momentum continue?

• 53 mins

Who's in charge: us or plastic?

How can we reduce the burden of plastic pollution?

• 53 mins

The Final Frontier

Is space colonisation the last hope for mankind or a dangerous distraction?

• 53 mins

Amazon Future

Drought and fire are devastating the Amazon rainforest. What can be done to save it?

• 52 mins

Good Clean Fun

How to cut the carbon from live music and sport and film and TV production.

• 52 mins

Christmas Trees

Helen Czerski and Tom Heap celebrate the urban trees of Britain.

• 53 mins

Reasons To Be Cheerful

How will 2025 shape up for the environment and wildlife?

• 53 mins

Arctic Goldrush

President Trump wants a slice of the Arctic. What does it mean for the region's wildlife?

• 53 mins

Cry Wolf

Wolves are back, right across Europe. Should we be nervous or welcoming?

• 53 mins

The Hole That Changed the World

40 years ago a hole was discovered in the ozone layer. It caused an international crisis.

• 53 mins

Forever Chemicals

The health impact of PFAS chemicals used in everything from frying pans to coats.

• 53 mins

How to Clean Up the Shipping Industry

The shipping industry is a big polluter. Tom Heap and Helen Czerski search for solutions.

• 53 mins

Paradise on the Edge

Travel to the beautiful islands of the Pacific - the front line of climate change.

• 53 mins

Set in Concrete

Our civilisation is based on concrete. Can we build in a cleaner way?

• 53 mins