A five-hour special called "Countdown" will launch on the Ted Talks YouTube channel on October 10
The prestigious Ted talks series is to hold its first-ever free live event next month, with Prince William and other prominent figures calling for action on climate change, the group announced on September 14.
Known for thought-provoking speeches recorded at exclusive events, the non-profit behind Ted will stream the five-hour special called "Countdown" on its YouTube channel on October 10.
The line-up of speakers also includes European Commission president Ursula von der Leyen, teenage climate activist Xiye Bastida, actor Chris Hemsworth, and former US vice president Al Gore.