Local plants vs imported plants is counter-intuitively not always straightforward. Inefficient farming in worse climates can sometimes use more fuel than farming it elsewhere and shipping it, transport only accounts for a small portion of greenhouse gas emissions in the production of the food.

http://blogs.ei.columbia.edu/2012/09/04/how-green-is-local-f...

http://freakonomics.com/2011/11/14/the-inefficiency-of-local...