Hal Harvey

The world around us is mainly made of two things: nature and the materials that we extract from it. To fight climate change, we need to protect and regenerate nature and transform materials into low- or zero-carbon alternatives. Session 4 of the Countdown Global Launch, hosted by Prajakta Koli and Hannah Stocking, features Thomas Crowther, Ernestine Leikeki Sevidzem, Brent Loken, John Doerr, Hal Harvey, Karen Scrivener, Tom Schuler, Rahwa Ghirmatzion, Zelalem Adefris, Prince William and Sigrid.

"The good news is it's now clearly cheaper to save the planet than to ruin it," says engineer and investor John Doerr. "The bad news is: we are fast running out of time." In this conversation with climate policy expert Hal Harvey, the two sustainability leaders discuss why humanity has to act globally, at speed and at scale, to meet the staggering challenge of decarbonizing the global economy (which has only ever increased emissions throughout history) -- and share helpful examples of promising energy solutions from around the world.