The process of building construction and its maintenance have harmful effects on the environment. The construction sector contributes 23% of the total CO2 emissions produced globally. The integration of natural ecosystems in the design of new buildings is needed to compensate the excess of CO2 emissions associated to city development. The installation of green facades on existing buildings or integrated into new constructions is a feasible solution to reduce the cities´ ecological footprint. It is time to paint Get Green!