The aim of this thesis is to explore the extent of sustainability of wood as a possible building material for an ecological transformation of a city. The very hypothesis is that timber construction solutions, at an urban scale, are a critical tool in the global effort to mitigate climate change, by turning dense urban cities into a continuous "carbon sink" that functions alongside the capacity of forests that are its renewable source. Together with this, the second hypothesis of this work is that timber construction and wood are not sustainable per se and that the extent of their sustainability when applied to urban building technologies shall be inquired and possibly modelized.