Bt Corn is used in Spain (about 12% of all corn) but not on any significant scale in other European countries. Studies have not shown any dramatic impact on the environment, but the jury is still out on this (ECOLOGICAL IMPACTS OF GENETICALLY ENGINEERED CROPS: TEN YEARS OF FIELD RESEARCH AND COMMERCIAL CULTIVATION Olivier Sanvido, Michèle Stark, Jörg Romeis and Franz Bigler December, 2006) I can recommend this study (you can find it at http://www.isb.vt.edu/articles/dec0603.htm) because I know the scientists and they are serious researchers not working for Monsanto or Greenpeace.
