Every new commercial building in France must meet a new building requirement; the roof must be at least partially covered in either solar panels or plants.

Whereas we commend France for striving to expand green rooftops, we prefer to see incentives, not mandates, when it comes to pushing renewable energy and sustainability.  That said, the environmental and energy saving benefits of green rooftops are significant and the backers of this movement should be applauded.

http://www.alternative-energy-news.info/france-green-rooftop-law/