Climate activist Greta Thunberg on the power of a movement
Although more Americans than ever are worried about climate change, less than 40 percent expect to make "major sacrifices" to tackle the problem. But according to Greta Thunberg, a Swedish teenager and climate activist, drastic action is exactly what's needed to address the problem. William Brangham sits down with Thunberg to discuss galvanizing young people across the globe to the climate cause.
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