New in Understand: Ten Fights That Made The Green Movement

The modern green movement has been shaped not only by protest, but by conflict within the ranks. Shared ideas are forged through friction - battles over tactics, solutions, or who gets a voice. Justin Rowlatt goes to the heart of these battles - to learn about these dramatic moments from the people who were there. Friends, or sometimes enemies, hashing out big ideas that help define what it means to be green.

Understand from BBC Radio 4 - unravelling the complexities of the biggest stories and subjects that really matter right now.