39 Ways to Save the Planet

A partnership between BBC Radio Four and the Royal Geographical Society, this series presents 39 ideas to alleviate some of the stress that climate change is exerting on our planet. They include some that are familiar, such as solar power, electric cars, eating more plant-based food and buying less stuff, but also others less so – such as big drop energy and green concrete. Arnold Schwarzenegger, inset, is among the guests.