After a few subway rides, we ended up at the Ufa-fabrik, formally described as one of Berlin's "cultural centers" but much much more. People have been living sustainably in this former location of the united film association since the 70s. Among the many projects we learned about were the Ufa tests with solar panels, focusing specifically on how to get them to orient to the sun without wasting energy. Another test shows whether greenroofs improve solar panel function (results suggest they can). The greenroof in the picture below is over 20 years old (nope that was not a typo- it's really that old)
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