Over the past year, Greta Thunberg has arguably done more to galvanise global action on climate than any other single individual.
And there is no question the unnerving power of her rhetoric comes in part from the fact that she is so young.
Or how about this: Thunberg is "the deeply disturbed messiah of the global warming movement", according to one Australian newspaper.
So, is Greta Thunberg the dour, vulnerable child with mental health issues that her critics present her as?.
Media playback is unsupported on your device Media caption Greta Thunberg: "I feel like what I am doing is meaningful".
"It felt like I was the only one who cared about the climate and the ecological crisis," Thunberg told me.
So, climate action remains very much a work in progress for Thunberg, despite her critics. »