Monsanto’s Round-Up implicated in monarch butterfly population decline in the Insect Conservation and Diversity Journal (March 2012).
According to researchers, during the 2009–2010 season and following a 15-year downward trend, the total area of overwintering monarch colonies in Mexico reached an all-time low.
Researchers found that monarch caterpillar habitat, had been almost completely destroyed by GM soy and corn in the Midwest. In addition, milkweed habitat has been lost due to increasing demand for biofuels.
It is one of the clearest examples yet of unintended consequences from the widespread use of genetically modified seeds, said John Pleasants, a monarch researcher from Iowa State in Ames, Iowa.
In contract, organic farming can increase the diversity of plants and animals, according to an analysis of over 180 studies. The analysis showed that on average, the number of species increased about 30% in organic systems and the number of individual plants and animals was 50% greater on organic farms.
Yet another reason to chose organic.