Too Much Of A Good Thing: The Cautionary Tale of Biotech Crops

Some of the most popular agricultural biotech products are running into problems. These plants have been genetically modified to fend off insects, and have been great for the environment and for farmers. But now they are not working as well. NPR food and agriculture correspondent Dan Charles explains the rise and potential fall of Bt crops, and what happens when farmers use too much of a good thing.

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