"It was an honor to spend time with Greta," the actor and environmentalist wrote on Instagram.
The 16-year-old activist spoke at a youth climate rally in Los Angeles during a week of wildfires ravaging California.
On "The Ellen DeGeneres Show," the 16-year-old Swedish activist shrugged off the idea of confronting the U.S. president on climate change.
The youth climate activist doesn't usually celebrate Halloween in Sweden, but she gave it a go this year.
The rise of "flight shame" in Sweden is persuading people to stay on the ground. Will the movement spread to the U.S.?
The 16-year-old activist was tapped for "breathing new life into the debate surrounding the environment."
Artemisa Xakriabá, 19, represents two groups most threatened by environmental destruction: indigenous tribes and young people.
“I’m sure that if they are challenged and if enough of us demand change — then change will come," the teen climate activist said.
The Canadian artist who created it is asking for the public to focus "that anger and fear into making large scale change" instead.
The 81-year-old actress was outside Congress to demand that lawmakers take action to address the “existential threat” of climate change.
A high school science teacher's frightening Facebook remark was forwarded to school district officials.
The climate activist is probably one of few teens on Earth who has had both the presidents of Russia and the United States throw shade at her.
Plus: Greta Thurnberg scolds world leaders, urging them to act on climate change.
“If you’re a grown adult who needs to yell at a child for some reason, the Greta Thunberg helpline is here to tolerate you,” the hilarious video's voice-over says.
The teen climate change activist said she didn't "understand why adults would choose to spend their time mocking and threatening teenagers and children for promoting science."
The 16-year-old, who was nominated for the actual Nobel Prize in March, shares the 2019 Right Livelihood Award with three others.
The president mocked the teen activist on Monday: “She seems like a very happy young girl looking forward to a bright and wonderful future.”
Fox News has remained quiet on her remarks, despite the network's condemnation of a commentator on a different show who called the 16-year-old "mentally ill."
The president responded to the 16-year-old's emotional speech at the United Nations Climate Action Summit, appearing to mock her on Twitter.