“I have always been conscious of my place on Earth and how much space I take up,” wrote Birks of her reasons for taking part. “I’ve tried to adopt more sustainable practices in my personal life but I feel constantly disappointed by the lack of institutional action. There was so much potential when the Liberals were elected last year but when it comes to climate change, they seem to say one thing but do another.”

Climate-conscious millennials helped give Trudeau’s Liberal party a majority in the last election, polling has suggested, and the power of the youth vote is only increasing, Climate 101 organizers argue.

“I’m ready for them to start taking real action,” Birks said. “I am ready for our government to start listening—and I know that, as young people, we have the power to make some big changes.”

Participants documented the day’s action on social media under the hashtag #Climate101:

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