Launching Countdown means asking big questions: What's the state of the climate today? What does climate science know? How are we going to achieve a net-zero future? How do we center climate justice in our work? This opening session of the Countdown Global Launch, hosted by Mark Ruffalo and Don Cheadle, features Johan Rockström, Angel Hsu, Antón...

Climate change is here, it's real, and it didn't happen overnight. Over the past 150 years, human activities like manufacturing, transportation, commercial agriculture and energy production have created a blanket of carbon pollution that's changed the Earth's ecosystems. But even though the climate crisis is deep-rooted and complex, we can't jus...

Climate change is the epic challenge of our lives, and community leaders like Rahwa Ghirmatzion and Zelalem Adefris are already working on sustainable, resilient solutions. Through their organizations in Buffalo and Miami, they're focused on durable, affordable housing for under-resourced communities, the most vulnerable to the instability of cl...

Combining new TED Talks with live performances, short films, expert conversations and more, the Countdown Global Livestream event vividly explains the climate crisis, focusing on solutions and calling for leaders and citizens everywhere to step up. Hosted by Latif Nasser, with appearances by AsapSCIENCE, Don Cheadle, TED science curator David Bi...

Witness the unveiling of Countdown, a major global campaign to cut greenhouse gas emissions. TED has partnered with scientists, policy makers, organizations, activists and more to create an initiative that everyone in the world can be part of. Check out http://countdown.ted.com to learn how you can get involved — and help turn the tide on climat...