Explore a crucial conversation on climate action between engineer John Doerr and policy expert Hal Harvey in this TED talk. Delve into the urgent need for global, rapid, and large-scale efforts to decarbonize the world economy. Discover why it's now more cost-effective to save the planet than to continue harmful practices. Learn about promising energy solutions from around the world and understand the race against time to cut greenhouse gas emissions in half by 2030. Gain insights on electrifying the grid, implementing effective policies, and the importance of continuous improvement in sustainable technologies. Understand the concept of national projects in tackling climate change and who controls the future of our planet. This talk, part of TED's Countdown initiative, offers a comprehensive look at the challenges and opportunities in creating a zero-carbon world.