The number of monarch butterflies that migrates across the United - TopicsExpress



          

The number of monarch butterflies that migrates across the United States each year and overwinters in the forests of Mexico has dropped to an all-time low. The decline of monarch butterflies over the last decade or more has coincided with the wide-scale adoption of genetically modified crops that are resistant to the weed-killer glyphosate. This change in our agricultural system has led to the near extermination of milkweed from huge swaths of our country, the only type of plant that monarchs use for laying their eggs. This year’s news follows a continuing downward trend — it signals a species in crisis.
Posted on: Fri, 31 Jan 2014 16:29:58 +0000

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