Video of Swedish teen climate activist Greta Thunberg crossing paths with President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE following her forceful speech at the United Nations on Monday quickly went viral across social media.

The encounter between the two came after Thunberg accused leaders of failing her generation during a blistering speech at the U.N. General Assembly climate summit.

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As Trump arrived for this week's U.N. General Assembly, cameras caught Thunberg, an activist who inspired the worldwide youth movement to combat climate change, staring directly at Trump. It remains unclear what exactly she was reacting to.

Her reaction quickly gained widespread attention, though, with many suggesting that Thunberg was glaring at the president in way that showcased her anger with the president and his stances on climate change.

Thunberg said last month that Trump "obviously" doesn't listen to science when assessing global warming.

"If a picture is worth 1,000 words then this GIF is worth 100,000," the news organization NowThis tweeted.

Others joked that the glare evoked one you'd give your "worst enemy" and that the look said "a lot." A headline on New York Magazine humorously read: "Greta Thunberg Accidentally Warms Globe With Her Scorching Glare."

Rep. Sheila Jackson Lee Sheila Jackson LeeGrand jury charges no officers in Breonna Taylor death Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (D-Texas) retweeted a post that said, "we are all Greta Thunberg."

Sommet de l'ONU: Greta Thunberg croise Donald Trump...et son regard en dit long pic.twitter.com/wC4VIeqFdw — BFMTV (@BFMTV) September 23, 2019

Greta Thunberg’s glare at Donald Trump is giving me the energy to get through this Monday pic.twitter.com/xdM0rdI2ln — Sam Stryker (@sbstryker) September 23, 2019

Find yourself someone who looks upon your worst enemy the way Greta Thunberg looks at Trump. pic.twitter.com/euhZ51abAB — Joel Berkowitz (@JoelBerkowitz) September 23, 2019

If a picture is worth 1,000 words then this GIF is worth 100,000 #ClimateWeek2019 pic.twitter.com/AqXdeUzgk3 — NowThis (@nowthisnews) September 23, 2019

Thunberg has gained a high profile over the past year for her consistent efforts to address the problems that climate change pose for future generations. She began her advocacy last year by handing out leaflets outside Swedish Parliament saying, “I am doing this because you adults are shitting on my future.”

In an emotional speech Monday, she railed against world leaders for forcing children to take the lead in the global fight against global warming.

“My message is that we will be watching you,” Thunberg said. “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.”

"People are suffering, people are dying, entire ecosystems are collapsing. We are in the beginning of the mass extinction and all you can talk about is money and fairytales of eternal economic growth. How dare you,” she added later.