Last September, I visited Greta Thunberg's Nordic homeland. When I arrived in her hometown of Stockholm, I just missed the celebrated young Swedish climate activist as she’d departed by solar-powered yacht to attend the UN Climate Summit in New York. But I did come to understand why Sweden is a global leader in the tourism-sustainability movement, and why Gothenburg, its second-largest city, has been named a European Capital of Smart Tourism 2020 by the European Commission.
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