Does the use of transgenic plants diminish or promote biodiversity?

NRC, 2002 Brookes, 2008 Ellstrand, 2003 CAST (Council for Agricultural Science and Technology) (2007) Implications of Gene Flow in the Scale-up and Commercial Use of Biotechnology-derived Crops: Economic and Policy Consequences. CAST Issue Paper 37, 24 p., http://www.cast-science.org/websiteUploads/publicationPDFs/CAST%20Issue%20Paper%2037%20galley-final-2149.pdf. Snow, 2003, A Bt transgene reduces herbivory and enhances fecundity in wild sunflowers, Ecol. Appl., 13, 279, 10.1890/1051-0761(2003)013[0279:ABTRHA]2.0.CO;2 Poppy, 2005 Watrud, 2004, Evidence for landscape-level, pollen-mediated gene flow from genetically modified creeping bentgrass with CP4 EPSPS as a marker, Proc. Nat. Acad. Sci. U. S. A., 101, 14533, 10.1073/pnas.0405154101