Bioengineered crops have mixed eco effects

An unusually large research project in Great Britain has revealed that growing beets and canola that had been genetically modified to resist herbicides lowers the abundance of other plant species and certain insect groups that typically grow along with these crops. On the other hand, cornfields harboring genetically modified (GM) corn that resists herbicides have more weeds and insects than regular cornfields did, according to a series of reports in the Nov.