At its most extreme, this way of thinking leads to eco-fascism, the belief the harm humans do to Earth can be reduced by cutting the number of non-white people.

But the mainstream green movement is also challenged by a less hateful form of this mentality known as ‘doomism’ – a creeping sense that humans will inevitably cause ecological disaster, that it’s too late to act and that technological solutions only offer more environmental degradation through mining and habitat loss.

What vision can environmentalists offer as an antidote to these depressing ideas? And how can green politics encourage radical thinking without opening the door to hateful ideologies?

Producer/Presenter: Lucy Proctor

Editor: Jasper Corbett