Millions across the globe have taken part in the biggest protest against climate-change on record.

Young people have taken the lead, skipping school and work to demand urgent action.

The week-long campaign aims to step up the pressure on world leaders gathering in New York for the United Nations General Assembly (UNGA).

The demonstrations started in the Pacific Islands before quickly getting started across Australia, Asia, Europe, Africa, the Middle East and North and South America.

Al Jazeera's Emma Hayward reports from London.

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