Sweden ’ s capital city , Stockholm , has a population of 960mn . The city ranks fifth in the People sub-category , 11th in the Profit category , but tops the Planet category thanks to investment in sustainable infrastructure , low emissions and good air quality . In 2010 , Stockholm was the first city to win the European Union Green Capital Award , and the city aims to be completely fossil fuel-free by 2050 . According to Interesting Engineering , Stockholm also uses excess heat from data centres , shops , and stadiums to heat the city ’ s homes . www . visitstockholm . com

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