LiveScience: Margaret Mellon is a senior scientist for food and the environment at the Union of Concerned Scientists (UCS). An expert on sustainable agriculture and the potential environmental risks of biotechnology, Mellon holds a doctorate in molecular biology and a law degree. This article was adapted from a post on the UCS blog The Equation. Mellon contributed this article to LiveScience's Expert Voices: Op-Ed & Insights. Farmers planting crops that can't be sold doesn't sound like a sensible proposition,...