Study of corn waste as fuel source finds gasoline less damaging to atmosphere
WASHINGTON — Biofuels made from the leftovers of harvested corn plants are worse than gasoline for global warming in the short term, a study shows, challenging the Obama administration's conclusions that they are a much cleaner oil alternative and will combat climate change.
A $500,000 study paid for by the federal government and released on Sunday in the peer-reviewed journal Nature Climate Change concludes that biofuels made with corn residue release 7 percent more greenhouse gases in the early years compared with conventional gasoline.
While biofuels are better in the long run, the study says they won't meet a standard set in a 2007 energy law to qualify as renewable fuel.
The conclusions deal a blow to what are known as cellulosic biofuels, which have received more than $1 billion in federal support but have struggled to meet volume targets mandated by law.
The biofuel industry and administration officials criticized the research as flawed. They said it was too simplistic in its analysis of carbon loss from soil, which can vary over a single field, and vastly overestimated how much residue farmers would remove once the market gets under way.
The research is among the first to attempt to quantify, in 12 Corn Belt states, how much carbon is lost to the atmosphere when the stalks, leaves and cobs that make up residue are removed and used to make biofuel instead of left to naturally replenish the soil with carbon. The study found that regardless of how much corn residue is taken off the field, the process contributes to global warming.