Yes, there is.
But again, current technology, corn- and wheat-based ethanol or biodiesel coming from canola, rendered animal fat, and other feedstock all have a net positive contribution on GHG reduction. Don't take my word for it. Take that of Natural Resources Canada. They've done a significant amount of research in this area. They have created what is considered a world class model, GHGenius, that looks at the full life-cycle analysis of the production of biofuels.
Contrary to my friend from the National Farmers Union who likes to cite studies like Pimentel's--he does not do life-cycle studies, his data is about 20 years out of date, and he is talking about old infrastructure that was in its early infancy in the United States with respect to biofuels production--we're talking about current real world data on facilities that are being built in Canada today. On ethanol it's a 40% to 60% benefit, and in biodiesel it's upwards of 75% to 95%, again depending on the feedstock input.
Don't take my word for it, Mr. Steckle. Take the word of Natural Resources Canada.