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Near extinction possible for monarch butterflies

A new study (abstract below) has found that the monarch butterfly population in the US has “a substantial probability of quasi-extinction, from 11–57% over 20 years”. The study repeats the well-documented fact that a major factor in the decline of the monarch is the adoption of herbicide-tolerant GM corn and soybeans. The herbicide spraying has killed off the monarch larvae’s only food, …