Controversial personality Sam Newman has labelled 16-year-old climate activist an “annoying little brat” after she addressed the United Nations Climate Summit.

The Swedish teen gave an emotional appeal in which she scolded world leaders with her repeated phrase, “How dare you.”

“This is all wrong. I shouldn’t be up here,” said Thunberg, who began a lone protest outside the Swedish parliament more than a year ago that culminated in Friday’s global climate strikes.

Newman took to Twitter criticising the activist and the Summit.

“This annoying little brat addressed the UN on the so-called climate crisis. Who lets this s*** have a platform? Mendacious, inbred sycophants, that who.”

Thunberg gave an impassioned speech directed at politicians and officials stating: “I should be back in school on the other side of the ocean. Yet you have come to us young people for hope. How dare you.

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“You have stolen my dreams and my childhood with your empty words.

“We are in the beginning of a mass extinction and yet all you can talk about is money. You are failing us.”

Later, she and 15 other youth activists filed a formal complaint with an arm of the UN that protects children, saying that governments’ lack of action on warming is violating their basic rights.

Sam Newman’s comments received an onslaught of responses, with many condemning his “disgusting” words.

“Funny, I’ve always thought the same thing about you Sam,” one person wrote.

Another added, “So is it ok when you abuse girls, but not when Adam Goodes does it? Cool cool cool.”

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Others leaped to his defence, exclaiming: “Well said Sam!”

Watch Greta Thunberg’s impassioned speech here: