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Explore a groundbreaking hour-long TED Talk unveiling Countdown, a major global campaign aimed at reducing greenhouse gas emissions. Join scientists, policy makers, organizations, and activists in this comprehensive initiative to combat climate change. Discover how world leaders, including UN Secretary-General Antonio Guterres, Al Gore, Katharine Hayhoe, Jimmy Kimmel, and Yuval Noah Harari, contribute their insights and expertise to this urgent cause. Learn about practical steps you can take to get involved and make a difference in turning the tide on climate change. Gain valuable knowledge on the intersection of technology, entertainment, design, science, business, and global issues as they relate to environmental sustainability.