'How dare you?' Greta Thunberg asks world leaders at UN

A visibly angry Greta Thunberg berated world leaders as she addressed a UN climate summit on Monday, accusing them of betraying her generation by failing to tackle greenhouse gas emissions and asking "How dare you?"

The Swedish teen, who has become the global face of the growing youth movement against climate inaction, began by telling her audience: "My message is that we'll be watching you," eliciting laughter.

But it was soon clear that the tone of the message would be very serious.

"This is all wrong. I shouldn't be up here. I should be back at school on the other side of the ocean," the 16-year-old, who is taking a year off from her studies, said.

"You come to us young people for hope. How dare you?" she thundered.

"You have stolen my dreams and my childhood with your empty words, yet I'm one of the lucky ones. People are suffering, people are dying, entire ecosystems are collapsing.

"We are in the beginning of a mass extinction, and all you can talk about is the money and fairy ..