Greta in the UN Environmental Talk at the interval of one year

Not many people knew who Greta Thunberg was at the UN climate talks last year.

Over the last 12 months, school strikes have led millions to do the same and demand more action against climate change.

The teenager has returned to Madrid for this year's Conference of the Parties (COP).

The BBC has followed its path from the beginning.

Laura Foster video

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