What. A. Year. These 25 TED Talks helped us make better decisions, taught us some fascinating science, gave us some hope for humanity and showed us what it's like to climb 3,000 feet ... without a rope.

Countdown is a global initiative, powered by TED and Future Stewards, to accelerate solutions to the climate crisis. The goal: to build a better future by cutting greenhouse gas emissions in half by 2030 towards reaching net zero by 2050. It was launched October 10, 2020 with the Countdown Global Launch, a virtual event featuring five curated se...