- Video report by ITV News Washington Correspondent Robert Moore
The Swedish teenager who has sparked a youth-driven push for action on climate change has taken part in a protest in Washington.
The 16-year-old has gained international attention by inspiring protests and school strikes demanding immediate action to avert environmental catastrophe.
- Young voices tell ITV News what climate crisis message they would like to give to Donald Trump
Her activism has drawn a passionate following of children challenging their elders to take action.
Last month, Greta crossed the Atlantic Ocean in a solar-powered boat, landing in New York on August 28.
She is in Washington for several days of rallies and lobbying efforts in advance of a global climate strike declared for September 20.
She will also address the UN Climate Action Summit in New York on September 23.