Interesting approach from Munich, my home town: district cooling, i.e. using cold water from inner city streams and distributing the cold to shops and offices,

Interesting approach from Munich, my home town: district cooling, i.e. using cold water from inner city streams and distributing the cold to shops and offices, so they don't have to use air conditioning. "produces far fewer CO2 emissions and reduces primary energy costs by around half": https://www.swm.de/english/m-fernwaerme/m-fernkaelte.html https://www.swm.de/english/m-fernwaerme/m-fernkaelte.html