A NSW private school principal has slammed 16-year-old climate activist Greta Thunberg, calling her a “little girl with self declared various emotional and mental problems”.

The head of the Coffs Harbour school wrote a letter to students and parents on September 26th urging them not to pay attention to Thunberg’s impassioned speech at the United Nations Climate Summit, which went viral last week.

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.

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The NSW school principal referred to Thunberg as a “little girl from Scandinavia” who was full of “doomsday waffle talk”.

In a letter obtained by the ABC, he wrote that she was simply a “little girl with self declared various emotional and mental problems that she thinks give her a special insight into a pending doom”.

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He added, “My life experience has taught me that the doomsday predictors are just attention getters” before urging students not to be afraid.

“Your world’s future is in the hands of God, not in the predictions of a little girl and false prophets.”

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.

“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.

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The attack comes after controversial personality Sam Newman labelled Greta an ‘annoying little brat’ in a scathing Twitter post. He was also joined by Pauline Hanson and ex-Top Gear host Jeremy Clarkson who also slammed the teen.

Watch Greta Thunberg’s impassioned speech here: