Some people, formerly including Bill Nye, are very concerned about monarch butterfly populations and other potential adverse environmental effects.

The trouble is that they feed exclusively on milkweed, a weed. All farmers, organic included, work hard to get rid of these weeds from their fields. In this sense, the argument is a moot point with regards to genetic engineering. This is a land use problem. Increased yields of GE crops over traditional and organic farming may eventually reduce total acreage converted for agriculture, allowing more lands for preservation.

If GMOs, labeling laws, or genetic engineering in general are topics you’re unsure about – this is the best debate on the subject. I highly recommend you watch it all the way through:


↓ Transcript
KATE
But they could be bad for the environment, you don't know.
ROB
People say that, but no such risk has ever been identified.

KATE
Butterflies. They're dying off because glyphosate is killing their food source.
ROB
All crops use herbicides to kill weeds.

KATE
So you admit it?
ROB
That herbicides kill weeds? Yep.

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