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...

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...