From unknown college lady to world well-known local weather change activist, the documentary I Am Greta chronicles two years within the lifetime of Greta Thunberg.

It was filmed virtually single-handedly by Swedish director Nathan Grossman, who initially thought he could be fortunate if her story made a brief function for the native information.

Surroundings correspondent Justin Rowlatt stories.

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Thunberg’s ‘surreal’ adventure told on big screen