Report Raises Alarm over 'Superweeds'

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The company expects up to $1.4 billion in gross profit for the year from its chemicals business, Begemann said, which would be a 10% increase from 2007. (Monsanto forecasts $3.5 billion in gross profit from its seeds businesses, a 16% increase.)

Environmental Impact Unclear

Superweeds are most directly a nuisance for farmers, who have to work harder to tend their fields and spend more on buying and applying herbicides. But the impact reaches consumers, too, argues Freese, as increased levels of chemicals hit plants and can work their way into groundwater. So far, the concerns have not hindered the adoption of biotech crops: On Feb. 13, a biotech industry group, the International Service for the Acquisition of Agri-Biotech Applications, is expected to release its own report showing an uptick in plantings of GMO crops around the world.

But many of the side effects, both actual and potential, continue to stir debate. Companies such as Monsanto, DuPont's (DD) Pioneer, and Syngenta (SYT) must submit environmental assessments to the U.S. Agriculture Dept.'s Animal & Plant Health Inspection Service (APHIS) before a biotech plant can be approved for commercial use. Freese argues, however, that more rigorous regulatory evaluations of biotech crops' impact can stave off environmental side effects. In March, 2007, a federal judge in Northern California halted plantings of biotech alfalfa, ruling that the USDA's oversight was inadequate.

For its part, Monsanto said in the Feb. 12 statement: "As part of the petition for deregulation, Monsanto includes information on glyphosate-resistant weeds and Monsanto's weed resistance stewardship program. USDA reviews that information, along with other information such as research journal articles, in preparing their environmental assessment."

Academics have been studying the impact of GMOs, but the research is still nascent. Just last November, the National Academy of Sciences convened a workshop of entomologists, geneticists, biologists, and others to discuss research priorities on how genetically engineered plants and animals impact the environment. The results are expected later in the year.

Hear a podcast debate about GMO Crops.

Hindo is BusinessWeek's Corporate Strategies editor in New York .