@Danfost : My problem with roof_greening is that it is not really an English term, and therefore unless hidden behind a preset will not occur as an obvious key to English speakers, and those whose favoured second language is English.

It looks like a literal translation of "die Dachbegrünung* and thus may work for German speakers, and although given as an EN term on Leo, is not one I have ever encountered, and nor has Google ngram.

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