I don't think it's appropriate to claim that use of Roundup is solely responsible for the decline in Monarch butterflies. Yes, improved weed control in increased monoculture acreage has decreased milkweed, but habitat loss in Mexico, the winter refuge of a major part of the Monarch population, has also played an important part in the decline.
I don't think it's appropriate to claim that use of Roundup is solely responsible for the decline in Monarch butterflies. Yes, improved weed control in increased monoculture acreage has decreased milkweed, but habitat loss in Mexico, the winter refuge of a major part of the Monarch population, has also played an important part in the decline.