REPORT BLASTS CORN-BASED BIOFUEL HEALTH RISKS
February 4, 2009
First-generation biofuels are not only failing to deliver expected cuts in carbon emissions but also pose a significant health risk, according to a new study from the University of Minnesota. The study, published in this month's Proceedings of the National Academy of Sciences, calculates that while second-generation cellulosic biofuels made from grasses and crops such as jatropha can deliver significant benefits, the economic costs to human health and well-being arising from corn-based ethanol are at least on a par with those accruing from petrol and can be far higher.
Researchers assessed pollutants emitted at all stages of the lifecycles of conventional gasoline, corn-based ethanol produced using three different methods, and four types of cellulosic ethanol and found that the combination of carbon emissions from changes in land use and particulates such as ammonia arising from fertilizer use and manufacture meant that corn-based ethanol had the highest environmental and health costs. Using computer models, they calculated:
- The total environmental and health costs of gasoline are about 71 cents (50p) per gallon, while an equivalent amount of corn-ethanol fuel costs from 72 cents to about $1.45, depending on the technology used to produce it.
- In contrast, the same amount of cellulosic ethanol costs from 19 cents to 32 cents, depending on the technology and type of materials used.
Jason Hill, a resident fellow in the University of Minnesota's Institute on the Environment and lead author of the report, said that the research underlined the scale of the environmental damage that could arise from corn-based ethanol.
"Our work highlights the need to expand the biofuels debate beyond its current focus on climate change to include a wider range of effects such as their impacts on air quality," he said. "To understand the environmental and health consequences of biofuels, we must look well beyond the tailpipe to how and where biofuels are produced. Clearly, upstream emissions matter."
Source: James Murray, "Report blasts corn-based biofuel health risks," BusinessGreen, February 3, 2009.
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