Is Replacing Fossil Fuel-based Plastics with Bio-based Plastics Sustainable?

Read this interesting Simply Green article regarding bio-based plastics (those derived from biological sources other than fossil fuels). Read more about 'bio plastics' here. Also see the first comment posted after the article in which it informs us that bioplastics are "made from two major commodity crops - corn (maize) and soy. Both of these are genetically modified and more to the point are grown using industrial agricultural methods, using fossil fuel based fertilisers, pesticides and chemicals. These plantations are spreading across the Amazon basin and other endangered places like the Cerrado and Pampas in S. America, using slavery (yes its still happening folks) and of course creating green monoculture deserts." Please send us your views on this.