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Why are the monarch butterflies disappearing?

The decline of the monarch butterfly in North America has been linked to the increased use of herbicide spraying on herbicide-tolerant crops.

„The most catastrophic thing from the point of view of the monarch butterfly has been the expansion of crops that are planted on an unbelievably wide scale throughout the Midwest and have been genetically manipulated to be resistant to the powerful herbicide Roundup…

…where they use these herbicides, it kills all emergent seedlings and all the emergent perennial plants. A paper last year by John Pleasants of the University of Iowa and Karen Oberhauser of the University of Minnesota estimated that 60 percent of milkweed has been eliminated from the grassland ecosystem. We’re not just talking about one species, we’re talking about the entire native flora being eliminated. This agriculture is killing off the wildflowers.“