After the devastating rebel invasion of Freetown in 1999 and the Ebola epidemic in 2014, Yvonne Aki-Sawyerr, mayor of the city, refused to be paralyzed by her frustration with the status quo. Instead, she used her anger as a catalyst for action. In this inspiring talk, she shares how she transformed her city by taking the risks necessary to brin...

Yvonne Aki-Sawyerr, mayor of Freetown, Sierra Leone, is on a mission to plant a million trees over the next two years, increasing vegetation in her city by fifty percent while shoring up eroding riverbanks and increasing biodiversity. "This isn't just about planting trees; it's about growing trees, and it's about ensuring that each one of us is ...

The climate crisis demands leadership at every level. Governments, cities and businesses are three key players in designing and implementing the necessary transition -- and putting climate back on the political and social agenda. Session 2 of the Countdown Global Launch, hosted by Al Gore and Jaden Smith, features Severn Cullis-Suzuki, Ursula vo...