I love the simple layout and idea of this calendar. Very nice! I do however miss some localizations. Is this calendar made for any specific country in mind? Is it possible to change? :)
I like the idea of working with nature to solve problems. As a start, instead of, as you suggest, depopulating Tehran, they could populate it with trees. Chad is a perfect example of how to turn a deserted landscape into a "Great green wall of Africa" as they call it. And they did in only two years.