A new study by Charles Benbrook shows that farmers in the US from 1996 to 2008 used 144 million kg (318 million pounds) of herbicides more then compared to conventional agriculture.
This is mainly caused by the development of herbicide resistant weeds and due to the fact that herbicide applications in conventional agriculture continuously decreased in the same period.

[img_assist|nid=107|title=|desc=|link=none|align=right|width=100|height=43] "How much Bt toxin do genetically engineered MON810 maize plants actually produce?"
Conference proceedings from Implications of GM crop cultivation at large spatial scales, University of Bremen, April 2008.

Ch. Then & A. Lorch, Conference proceedings from Implications of GM-Crop Cultivation at Large Spatial Scales (GMLS), April 2008.

[img_assist|nid=108|title=|desc=|link=none|align=left|width=100|height=43]South Africa’s Agriculture and Research Council (ARC) has announced their intention to apply to the SA government for permission to make GM potatoes commercially available, The potato in question is a Bt potato carrying the antibiotic resistance gene nptII as a marker - the same antibiotic resistance gene that currently holds up the approval procedure of BASF's starch potato Amflora in Europe.

[img_assist|nid=174|title=|desc=|link=none|align=right|width=100|height=43]Im folgenden Report werden einige mögliche Auswirkungen des Bt-Maises auf die Umwelt dargestellt. Selbst nach mehr als 10 Jahren kommerziellen Anbaus von Bt-Mais gibt es nur wenige Studien zur Risikoabschätzung. Zugleich werfen die meisten dieser Studien mehr neue Fragen auf, als sie beantworten.

A. Lorch & Ch. Then, Greenpeace, June 2007.

[img_assist|nid=174|title=|desc=|link=none|align=right|width=100|height=43]The report presented here shows the many ways Bt maize impacts the environment. Even after more then a decade of commercial growing of Bt maize crops, the risk assessment studies are still few and most of them tend to raise more open questions than solving concerns.

A. Lorch & Ch. Then, Greenpeace, June 2007.