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Lessons in rethinking the climate emergency from Sierra Leone and the US. We hear from mayor of Freetown Yvonne Aki-Sawyerr on her plans to plant a million trees, and make climate change relevant to the citizens of the rapidly urbanising capital city. Harvard鈥檚 Rebecca Henderson argues that capitalism can provide at least part of the solution, and companies need to price in climate damage, making them financially accountable.

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