Greta Thunberg in the UN climate at the interval of one year

At the UN climate talks in Poland last year, few knew who Greta Thunberg was.

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

The teenager returned to Madrid for this year's Conference of the Parties (COP) and the crowd bothered her as soon as she arrived.

The BBC has followed its path from the beginning.

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