One of the world’s richest men has sold his private jet. Berbard Arnault — the co-founder of Louis Vuitton — says he sold his plane because climate activists on Twitter were tracing his flights and calculating their carbon emissions. The World’s host Marco Werman speaks to Sola Zheng, an aviation researcher at the International Council on Clean Transportation. Zheng shares the idea of a frequent-flier levy that could help fund research in sustainable aviation.
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