Greta Thunberg: Climate change activist's 'How dare you' message to world leaders

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WATCH: Greta gives a passionate speech to world leaders

Environmental campaigner Greta Thunberg is known for her strong speeches on climate change.

And the 16 year old has delivered yet another powerful message to world leaders - this time at the United Nations Climate Action Summit in the United States.

UK Prime Minister Boris Johnson is amongst those at the meeting in New York.

She's asked world leaders to do more to tackle the problem: "You say you hear us and that you understand the urgency. But no matter how sad and angry I am, I do not want to believe that, because if you really understood the situation and still kept on failing to act, then you would be evil and that I refuse to believe."

My message is that we'll be watching you. This is all wrong. 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 young people for hope. How dare you. You have stolen my dreams and my childhood with your empty words. Yet I am one of the lucky ones. People are suffering.

Greta Thunberg

Greta added: "You are failing us. But the young people are starting to understand your betrayal. The eyes of all future generations are upon you. And if you choose to fail us, I say, we will never forgive you. We will not let you get away with this. Right here, right now is where we draw the line. The world is waking up, and change is coming whether you like it or not. Thank you."

Greta made her speech after sailing from the UK to New York rather than travelling by plane.

The summit also comes after the activist inspired millions of young people to join a global climate strike.