Controversial football personality Sam Newman has labelled Greta Thunberg an 'annoying little brat' after she addressed the United Nations Climate Summit on Monday.

The Swedish 16-year-old scolded international delegates telling them 'you have stolen my dreams and my childhood with your empty words' during a speech at the UN headquarters in New York.

Newman took to Twitter after the address with an extraordinary criticism of the climate change 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.'

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Controversial football personality Sam Newman has called eco warrior Greta Thunberg an 'annoying little brat' after she addressed the United Nations Climate Summit on Monday

The Swedish 16-year-old scolded international delegates telling them 'you have stolen my my dreams and my childhood with your empty words' during a speech at the UN headquarters in New York

The UN summit convened to have nations make plans to confront global warming and rising fossil fuel emissions.

Thunberg gave an impassioned speech directed at politicians and officials saying: 'I shouldn't be up here. I should be back in school on the other side of the ocean.

'Yet you all come to us for hope. How dare you. You have stolen my dreams and my childhood with your empty words.

'We are in a mass extinction. And all you can talk about is money and fairytales of eternal economic growth. How dare you!'

A flood of Twitter users were quick to hit back at Newman for his comment, with one saying he was a 'sad excuse of a man'.

'You're a sad excuse of a man, picking on a 16-year-old girl with aspergers, all because she and millions of her peers care about the future of our planet,' one wrote.

'Climate change won't bother you, you'll be long gone!' another wrote.

One added: 'You can't object to someone's thinking without being vitriolic, can you? Particularly if they are female.'

A flood of Twitter users were quick to hit back at Newman for his comment, with one saying he was a 'sad excuse of a man'

Newman's (pictured) bold comment comes after US President Donald Trump mocked Thunberg in a tweet following her address

Very few leaped to Newman's defence, with one saying his 'description' of Thunberg was 'completely accurate'.

'Well said Sam,' one wrote.

Newman's comment comes after US President Donald Trump mocked Thunberg in a tweet following her address.

Very few leaped to Newman's defence, with one saying his 'description' of Thunberg was 'completely accurate'

'She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!' President Trump tweeted.

The summit, entitled 'A Race We Can Win. A Race We Must Win' discussed energy transition, climate finance, carbon pricing, industry transition, nature-based solutions, cities and local action and resilience.

Thunberg skyrocketed to fame after she started demonstrating outside the Swedish Parliament in 2018, sparking climate protests in her nation.

She was nominated for the Nobel Peace Prize and travelled to to he US by yacht to avoid flying on a plane last month.

Trump mocked the schoolgirl, saying: 'She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!'