Growing and harvesting bioenergy crops—corn for ethanol or trees to fuel power plants, for example—is a poor use of land, which is a precious resource in the fight against climate change, says a University of Michigan researcher. Untampered green areas like forests and grasslands naturally sequester carbon dioxide, and they are one of society’s best hopes for quickly reducing the greenhouse gas in the atmosphere, says John DeCicco, a research professor at the U-M Energy Institute.