Tracking the Causes of Sharp Decline of the Monarch Butterfly

A new census found this winter’s population of North American monarch butterflies in Mexico was at the lowest level ever measured. Insect ecologist Orley Taylor talks to Yale Environment 360 about how the planting of genetically modified crops and the resulting use of herbicides has contributed to the monarchs’ decline.

by richard conniff

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Tracking the Causes of Sharp br/ Decline of the Monarch Butterfly by Richard Conniff: Yale Environment 360.

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