It’s 20 years since the Stern Review declared that the costs of inaction on climate change are much higher than the costs of action. So why are emissions continuing to rise? Lord Nicholas Stern tells Bloomberg’s Akshat Rathi why he is optimistic about our ability to tackle climate change and what makes those actions the growth story of the 21st century.

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• Read for free: The Growth Story of The 21st Century

Zero is a production of Bloomberg Green. Our producer is Oscar Boyd. Special thanks to Sommer Saadi and Alyssa McDonald. Thoughts or suggestions? Email us at zeropod@bloomberg.net. For more coverage of climate change and solutions, visit https://www.bloomberg.com/green.