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.
Read more:
Thunberg’s ‘surreal’ adventure told on big screen
source: bbc.com