Replacing traditional roofs with gardens is something that I have long advocated. It saves on heating and cooling costs (and therefore reduces pollution) but the plants also help filter the air and improve the building’s aesthetics. I’ve kindly borrowed a few photos from The Grow Spot. These buildings and gardens are amazing. I love it. These would also go well with the vertical gardens. Just imagine massive buildings in New York City someday completely covered with plants. We will have to wonder why we never did it sooner.