New film "I am Greta" captures the evolution of the climate movement led by the Swedish activist

I Am Greta helps viewers get closer to Thunberg, who is now 17 years old. Photo: Filmwelt/Verleihagentur/dpa

Two years ago, on a summer’s day, a school student held a strike, launching a movement that continues to make waves worldwide.

After the summer holidays, rather than returning to school, Greta Thunberg went to stage her own climate protest in front of Sweden’s parliament.