Monsanto will aggressively challenge the labeling of Roundup as cancerous, it is used in their pesticide cocktail to grow genetically modified crops using GMO seeds.  DuPont, Pioneer, Syngenta, Dow, BASF, and Monsanto are doing experimental testing on Kauai.  The residents of Waimea Kauai filed a lawsuit b/c the landowner Gay & Robinson failed to control pesticide- contaminated dust and erosion that was related to the company's GMO test sites.  Local farmers reported their crops were being affected by the runoff from plants/soil, pesticides, and the decrease of the local bee population.  The GMO crops are being tested for use in livestock and human food.  Monsanto has a farm on Oahu in Kahuku also.

A warning label of known to cause cancer on Roundup will definitely have a huge impact on Monsanto.