The kids are back at it again and this time they're setting the bar even higher, taking over streets across the world for their second climate change strike.
From London to Washington and India to Spain, passionate youngsters skipped school to demand that world leaders take urgent action on climate change – and of course, they did it in their own unique ways.
To celebrate these inspiring young people, we've rounded up some of the best posters from the marches.
What use is a sign without a great pun, am I right?
Some paid tribute to their fearless "leader", Nobel Peace Prize nominee and general bada** Greta Thumberg.
Obviously there were also memes, because why not?
Some felt like they had some reminding to do...
Lots of boyfriend posters too.
Even the little ones showed their support.
Adults... take note.