Go see this film Food Inc! I just went to see this and was surprised by how much I didn’t even know about, especially when I consider myself to be fairly conscious of my food and environment. Even if you don’t live in the US, it’s still really important to see what’s happening to our food here, and to help prevent it from spreading to other parts of the world. Especially in France, it might help to prevent the ban on genetically modified seeds from being lifted.
Also while on this topic, check out Eco Trip, it’s entertaining and fascinating to see what goes into making things and their large scale impact.