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Ep 5. YouTuber Mark Rober – Planting Trees 'With Tooth Fairy Money'

YouTuber Mark Rober explains how he galvanised people into planting 20 million trees.

• 30 mins

Planting Trees, Part 2

Monica Bohm from the Zoological Society of London explains how trees support eco-systems.

• 23 mins

Ep 6. Lily Cole and Bella Lack - Hope And The Imperfect Environmentalist

Model Lily Cole and conservationist Bella Lack on staying optimistic.

• 41 mins

Ep 7. 'A New Economy Waiting to Be Born’

Can our economy be prosperous and green? Kate Raworth and Rebecca Henderson discuss.

• 46 mins

Ep 8. Reimagining ‘Business As Usual’

Entrepreneurs Norman Crowley and Sian Sutherland discuss business and climate change.

• 38 mins

Ep 9. Foals’ Edwin Congreave – ‘A Message People Don’t Want To Hear’

Edwin Congreave from Foals talks about the impact of live music touring on the climate.

• 30 mins

Stubborn optimism and leadership, Part 2

In part 2, we hear from some of the world’s leading young activists.

• 33 mins

Ep 10. Christiana Figueres – Stubborn optimism and leadership

The former UN climate chief and her political strategist discuss leadership and optimism.

• 40 mins

Bonus content: Our 10 favourite climate solutions

Matt McGrath and Vic Gill choose their 10 favourite climate solutions from the series.

• 13 mins

Bonus content: Brian Eno and James Thornton - ‘Changing The System’

Brian Eno and lawyer James Thornton discuss how the law can tackle climate change.

• 40 mins

What do YOU want to ask the experts?

Liz Bonnin and the ‘What Planet Are We On?’ team ask for your climate questions.

• 1 min

COP26: Your climate questions answered!

Ahead of the critical climate summit, we put your questions to the experts.

• 62 mins