Climate activist Greta Thunberg just gave Trump a fiery staredown at the U.N.

The look Greta Thunberg just gave President Trump might be more heated than our Earth's warming atmosphere.

The 16-year-old climate activist has become the de facto leader of worldwide protests against climate change action, helming a massive march in New York City on Friday and inspiring hundreds more happening simultaneously around the world. Her activism continued as she addressed the United Nations Climate Summit on Monday — and translated into a very fierce glare as Trump walked into the summit for a few minutes.

After Thunberg's brutal speech to the gathered world leaders, she and 15 other children filed a complaint with the U.N. alleging five of the world's top carbon producers are violating human rights by not doing enough to curb climate change. They want the five countries — Argentina, Brazil, France, Germany, and Turkey — to reduce their emissions and get on track immediately.

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