Joaquin Phoenix and Rooney Mara will present the “Transforming” section of the livestream. Countdown is a global initiative to champion and accelerate solutions to the climate crisis. The goal is to build a better future by cutting greenhouse gas emissions in half by 2030 in the race to a zero-carbon world — a world that is safer, cleaner and fairer for everyone. Every person, organization, company, city and nation is invited to collaborate with Countdown and take action on climate. It is a movement open to everyone — and everyone has a vital role to play