You’ve probably seen the pictures of clear canals and blue skylines as the world shuts down. They look like scenes from a better future. But most of them are real, and there’s not a lot of good news at the moment, so maybe we should take what we can get... A global pandemic causes a massive change in human behaviour, and as it upends the world it can also offer us some lessons on what is essential and what is not. And if we can learn from this shock to our collective systems, perhaps we can prevent the next one. GUEST: Katherine Hayhoe, climate scientist