The majestic American chestnut was once common in forests in the eastern U.S., but a blight has killed billions of these giant trees. Researchers are moving forward with genetically-modified trees that will survive the blight.

But as Julie Grant of The Allegheny reports, critics think genetically-engineered chestnuts could adversely damage the ecosystem and lead to a slippery slope of other GMO approvals.

This segment aired on November 23, 2020.

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