http://edition.cnn.com/2017/01/04/architecture/vincent-callebaut-tao-zhu-yin-yuan/index.html
It's easy to plant trees on each floor of skyscrapers, but it costs a lot to maintain them. As long as the building is sold for the rich, it's not difficult to keep ends meet.
Well, anyway, the way of considering ecology building instead of just constructing the highest buildings is better.
