Although Trump is known to be a climate change denier, the decision by the leader of the planet’s second-largest carbon emitter to leave the Paris accord shocked many people.

The president has also scrapped his predecessor Obama’s Clean Power Plan, as well as giving the green light for more drilling and fracking on federal land.

As she sailed across the Atlantic to New York in August, Thunberg had some advice for the American president: “My message for him is listen to the science and he obviously doesn’t do that,” she said.

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Greta Thunberg says she wouldn’t waste her time speaking to Trump about climate change