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Trump has repeatedly expressed skepticism that climate change exists and his administration repealed a key clean water rule on Thursday.

After staying with the crowd and speaking with fellow activists during the march, Thunberg, on arriving in front of the White House fence, grabbed a megaphone and addressed her audience.

“I am so incredibly grateful for every single one of you and I’m so proud of you who have come here” she said. “Never give up, we will continue and see you next week on September 20th.”

At Friday’s event, youth climate protesters expressed high praise for Thunberg and her efforts.

“Greta is an unbelievable human being and I have never seen anything so inspiring in my entire life,” said climate activist Ashley McHenry. “She’s done more for a single issue that adults couldn’t have done in 20 years.”

\"PHOTO:
Nicholas Kamm/AFP/Getty Images
PHOTO: Teenagers and students take part in a climate protest outside the White House in Washington, D.C. on September 13, 2019.
>

She chose to sail across the Atlantic to raise awareness about the toxic emissions that come with flying and after arriving in New York City, she was featured in appearances on “CBS This Morning” as well as “The Daily Show with Trevor Noah.”

Her actions first captured international recognition in August of last year when she demonstrated in front of the Swedish parliament to push lawmakers to take action on climate change. Her actions spurred “Fridays for Futures,” which has turned into a worldwide movement calling on students to stage school walkouts to protest about climate change.

ABC News' Alexandra Skovos contributed to this report

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