Greta Thunberg Shrugs Off Donald Trump's Mocking Tweet: 'It Doesn't Make Any Difference'

Greta Thunberg shrugged off President Donald Trump's tweet following her emotional speech about climate change at the United Nations General Assembly, saying she expected him to make comments about her.

Thunberg, the 16-year-old environmental activist who rose to global fame after founding the school strike for climate campaign, was at the U.N. headquarters in New York City to deliver a speech to world leaders when she crossed paths with Trump.

The moment she laid eyes on him went viral on social media. Thunberg can be seen glaring as Trump and his entourage walk past. In an interview with Swedish show Skavlan, Thunberg recounted the moment.

"I was stopped because suddenly he came in and security went you have to step to the side, and then I just wondered what was going on, and then he showed up and I was, I think, very shocked," Thunberg said.

The host read out Trump's tweet about Thunberg's speech, during which she appeared tearful as she chastized global governments for their inaction on climate change.

Alongside a clip of Thunberg's speech, Trump tweeted: "She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!"

"You can interpret it in different ways. Many different ways," Thunberg said. "But, I mean, I knew that sometime he is probably going to say something about me. And it was like, it doesn't make any difference, in a way."

The host then asked Thunberg if she read any sarcasm in Trump's tweet. "Well, of course I do, but, yeah, of course he is going to write that," Thunberg said, dismissively.

Thunberg had sailed across the Atlantic to New York City in order to avoid using planes because of their climate-damaging emissions. She took part in the recent school strike, addressing the thousands of protesters who turned out on the city's streets.

Then, on Monday, she spoke to heads of governments from across the world in her address to the U.N. "This is all wrong. I shouldn't be up here. I should be back in school on the other side of the ocean," Thunberg said, her voice breaking.

"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. And yet, I'm one of the lucky ones.

"People are suffering. People are dying, and dying ecosystems are collapsing.

"We are in the beginning of a mass extinction and all you can talk about is money and fairytales of eternal economic growth. How dare you?"

After Trump's derisive tweet, Thunberg used it as her biography on her Twitter profile.

Greta Thunberg Donald Trump Twitter mocks speech
Greta Thunberg speaks at the United Nations (U.N.) where world leaders are holding a summit on climate change on September 23, 2019 in New York City. Thunberg said President Donald Trump's mocking of her "doesn't make a difference." Spencer Platt/Getty Images