Such a modern dilemma. You are invited to a climate change conference overseas. How do you travel? If you are going to Google’s Davos-on-Sea in Sicily, as Prince Harry and Leonardo DiCaprio did last week, you take international jets and helicopters, hoping your good intentions will offset your CO2 emissions. If you are Greta Thunberg, you find a prince in a shining carbon-fibre boat to take you.

Next month Thunberg is heading to the UN Climate Action Summit in New York courtesy of Pierre Casiraghi, nephew of Prince Albert of Monaco. A stranger seafaring pair is hard to imagine, but the 16-year-old climate activist and Casiraghi, a dashing 31-year-old with a sailor’s beard and a former model for a wife, will spend two weeks together in a 60ft yacht, crossing the Atlantic. Her reason is flygskam, Swedish for “flight shame”. His? Well, it may be Jacques Cousteau.

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