A new report on the large scale GM field trials of GM oilseed rape, sugar beet and maize in the UK conducted 1999-2002 shows that detrimental effects of the GM crops on biodiversity have persisted the following two years after the farmers went back to conventional cultivation.</p><p><a href="http://news.bbc.co.uk/1/hi/sci/tech/4287044.stm">BBC: GM crop impact 'lasts two years'</a></p><p><a href="http://www.pubs.royalsoc.ac.uk/bio_let_home_link_3.shtml">Original study: Effects of gm herbicide-tolerant cropping systems on weed seedbanks in two years of following crops</a>