Here he answered some questions. An ecological building should not be a weapon in a retreating battle. On the contrary it can contribute positively to the environment. A green area is a productive area. So the building can generate energy instead of consume it.
Modern buildings tend to have large transparent outer surfaces.
The advantage of glass is that it reduces the need for artificial lighting. The disadvantage is that it hampers a building's ability to deal with heat. There is a balance when the glass surface is about 35 percent of the whole. On the other hand exploitation is cheaper, because energy consumption is lower. We don't design until we've got the financials right.