I live part of the year in a city where there are hardly any green spaces and trees and the calming effects of a walk through a park is missed as much as a stroll along a road lined with trees. I dedicate myself to the absence of "green” in this city with rather ­­muted and symbolic tones. This city is representative of many cities, where the proportion of natural and green areas tend to decline rather than rise.

Cities are among the largest CO2 emitters and contribute significantly to the increasing temperature on  earth.