The lawsuit, Juliana v. United States, was recently thrown out by a federal appeals court. But Foytlin says she's formed lasting friendships with the other plaintiffs. "We all share one thing in common — we really care about where we're from, and how we are going to continue to live [here]."

In upstate New York, Scout Pronto Breslin, 16, is focused on wildlife. She lives in Rhinebeck, and is the founder of a group called Hudson Valley Wild. "I volunteer at a wildlife rehab clinic," she says, explaining what motivated her activism."The birds there often come in with blood poisoning because of illegal toxins from chemical runoff and fertilizer."

Pronto Breslin advises other teens to find what really interests them about the climate movement. She says it could be composting in their schools, gardening, nature: "Once you find something that you really love, then that will just give you motivation to keep going with it."

One of the world's youngest climate activists, Licypriya Kangujam started advocating for local and global climate action since the age of six, where she protested outside the Indian parliament with a specific set of demands, including air pollution laws and to make climate-change literacy mandatory in schools.

NPR talked to four teenage climate activists, all girls, from the U.S. and Australia, alongside their mothers. These teenagers are juggling activism with schoolwork and personal time. And their families are working hard to support them as they grapple with the heavy emotions that come with fighting for the future.

In Castlemaine, Australia, Milou Albrecht, 15, co-founded School Strike for Climate Australia, which organizes student walkouts. As massive bush fires engulf parts of her home country, Albrecht's group has been pressuring the German corporation Siemens to withdraw from an Australian coal mining project.

In New York City, Xiye Bastida, 17, led her school in the city's first big student climate strike last March, and along with traveling and public speaking, she and some of her classmates have continued to strike on Fridays ever since. ("Gym is on Fridays, so I have a very low grade in gym," she notes.)