Tyler Colman, better known perhaps under his blogger pseudonym Dr Vino, has made a study of what greenhouse gases your wine consumption generates. Being in the US, the basic question he asked was “Is it better (=lesser emissions) to drink a wine from Bordeaux or one from California”. The Bordeaux wine will need longer transport but the transport will be for the longer part of the journey on boat, whereas the Californian wine will be trucked. The result was that it is “better” (causing less emissions) to drink Bordeaux on the East Coast and up until aline going north-south through Ohio and Texas. West of that “green line” it is better to drink Californian wine. this is of course just one aspect of being environmentally friendly. there are many other aspects to look at to get the full picture, for example the production methods, soil treatment and fertilization, irrigation, and much more. Perhaps in a future 2.0 edition of the Dr Vino report? More info and the green line map on DRVino.com
