Fonte: Questa Galleria fotografica è tratta dal sito del National Geographyc Italia:
http://www.nationalgeographic.it/ambiente/2012/06/22/foto/undici_lavori_verdi_in_crescita-1109054/1/#media
This project has been funded with support from European Commission. This publication [communication] reflect the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.