Movie tells Greta Thunberg's 'coming of age' story
From unknown school girl to world famous climate change activist, the documentary I Am Greta chronicles two years in the life of Greta Thunberg.
It was filmed almost single-handedly by Swedish director Nathan Grossman, who originally thought he would be lucky if her story made a short feature for the local news.
Environment correspondent Justin Rowlatt reports.
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