The group of about 100 included high schoolers, politicians and organizers with established activist groups like Socialist Alternative Pittsburgh.

No one knows exactly how many people participated in Friday’s worldwide climate strike, but it’s clear the number is in the millions. In Pittsburgh, the youth-led protest brought hundreds Downtown.

Leandra Mira has been leading Fridays for Future in Pittsburgh since June. Now, she and her fellow organizers are getting ready for this Friday's national youth climate strike.