Green roofs date back to before the time of the Romans . Not just aesthetic , they help fight against climate change , especially in cities . Germany 's green roof movement is the biggest , taking up 10 percent of all flat roofs . Supporters say this increase is need to spur growth elsewhere .
Green roofs date back to before the time of the Vikings . Not just aesthetic , they help fight against climate change , especially in cities . Germany 's green roof market is the biggest , making up 10 percent of all flat roofs . Supporters say government support is need to spur growth elsewhere .