TIME Magazine has selected Climate change activist Greta Thunberg as the Person of the Year. At 16, she's the youngest person to get the recognition. She's credited with inspiring a worldwide movement calling for more urgent action to cut carbon emissions.  CGTN's Asieh Namdar speaks with Erin Bergren, assistant professor of Environmental Studies at North Central College, for more on youth climate movements and what Thunberg's win means.