Prince William, His Holiness Pope Francis, Yemi Alade, Monica Araya, Xiye Bastida, Jesper Brodin, Don Cheadle, Dave Clark, Christiana Figueres, Al Gore, António Guterres, Chris Hemsworth, Kara Hurst, Lisa Jackson, Rose Mutiso, Johan Rockström, Prince Royce, Mark Ruffalo, Sigrid, Jaden Smith, Nigel Topping and Ursula von der Leyen join scientists, activists, artists, schools and leaders […]