Teenage climate activist Greta Thunberg arrived in New York yesterday for a United Nations summit after a 15-day journey across the Atlantic in a zero carbon yacht. 

She’s caught the world’s attention in the past year after starting a school climate strike that has since spread across the world. But she’s also been a lightning rod for criticism - including from businessmen and British conservative MPs. So why does she attract so much criticism?

Ivan is joined by Cara Augustenborg, Newstalk's climate correspondent, and Brendan O’Neill, the editor of Spiked