Marine flora can help to reduce world hunger, pollution, the impact of climate change, disease, biodiversity loss and social inequality. What would the world look like if we fully exploited its potential?
International leader on global climate change Christiana Figueres speaks to Andy Haldane about how outrage helps fuel her optimism for the future of our planet – and the significance of a little golden toad.
How has the environmental movement changed over the last generation? What motivates people to get involved? What strategies are needed to create change?