Study: Global warming may poison monarch butterflies

This article discusses how global warming may lead to the extinction of the Monarch Butterfly, by causing its only food supply, milkweed, to become too toxic.

But now, scientists say they have discovered another threat to monarchs. In a study recently published in the journal Ecology, researchers at Louisiana State University (LSU) put forth findings that indicate global warming may be making remaining milkweed plants more toxic.

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