A dynamic financial hub with a strong green ethos, Frankfurt has been crowned the world's most sustainable city, according to a new ranking.
Consultancy Arcadis' Sustainable Cities Index, published on Monday, ranked 50 of the world's most prominent cities by looking at their environmental progress, viability as a place to live and financial stability.
"Frankfurt's high ranking in the Sustainable Cities Index may come as a surprise, however, the self-proclaimed 'Green City Frankfurt' has a long track record of proactively taking action to improve its sustainability," Arcadis said.
The index takes into account 20 different indicators ranging from greenspace to income inequality to ease of doing business.
Arcadis defines a sustainable city as one that "works well for their citizens in the present without causing problems for themselves and the rest of the world in the future."
Roughly half of Frankfurt's surface area is "green", according to the city's environment department, which notes that 52 percent of the city area has been set aside for recreation and to offset climate change. It consists of parks, woodland, farmland, orchard meadows, grassland, allotments and hobby gardens, cemeteries, roadside grass verges and bodies of water.