Swedish teenager Greta Thunberg pioneered a climate change campaign that swelled from a one-person school strike by the then 15-year-old to a worldwide movement.
In August 2019, Thunberg sailed into New York Harbour on a zero-carbon emissions vessel, completing a nearly 14-day journey from England to take part in a United Nations climate summit.
Meanwhile, the total number of climate strikers reached 3.6 million people across 169 countries.
(Photograph:AFP)