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The gains from GM crops are a lie[1] - most GM crops are made so agri-chemical companies can sell more pesticide for pesticide-resistant crops. Overuse of pesticides is killing all the insects and ruining soil quality.[2]

If you want to get more efficiency out of the food system you can easily do that by going vegan. Raising livestock provides just 18% of calories but takes up 83% of farmland. If you cut out meat you get 83% of the farmland back. You don't even need to cut out meat completely - just have a couple more meals each week without meat and you're saving many times more than any GM crops could achieve.

[1] https://www.ucsusa.org/resources/failure-yield-evaluating-pe...

[2] https://www.ucsusa.org/resources/hidden-costs-industrial-agr...