Greta Thunberg has started an international youth movement against climate change

Greta Thunberg: Climate change activist is halfway to the US on her boat journey - send her your messages It's a busy week for climate campaigner Greta Thunberg. The 16-year-old is marking a year since she began her 'School Strike for Climate' protests and she has just reached the halfway point of her big boat journey to the US.  Back in August last year Greta called on school children across the world to miss school every Friday to protest against climate change.

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