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The fifth-largest city in Germany , Frankfurt is home to over 730,000 people . According to the European Commission , the city is committed to controlling and reducing its environmental impact . “ All new buildings in Frankfurt must be passive , i . e . meet strict standards for energy use .” Frankfurt was ranked as the world ’ s most sustainable city by Arcadis in 2015 . According to the 2018 report , the city has been “ highly successful in combining economic prosperity and environmental stewardship .” www . frankfurt . de JANUARY 2019