When she was fifteen years old, Greta Thunberg’s teacher explained to her class that our climate is changing—the earth is getting warmer, the polar ice caps are melting, and life on earth is threatened. Greta was devastated. So she went on strike, skipping school every Friday to sit outside of the Swedish Parliament building with a sign that read “School Strike for Climate.”

At first, Greta was the only one. But gradually, more and more students joined her, until her lone protest had sparked a worldwide student movement for action on climate change. Now, a year later, Greta is speaking to audiences of world leaders and sparking worldwide conversation on how to save our planet. Greta is showing everyone that even the smallest person can make a big difference