If we let the cows eat the grass they have evolved to eat; rather than giving them major indigestion with corn and soy, then that would largely solve this particular problem.
This would also save a lot of greenhouse gases by not growing all that soy and corn and shipping it all over the world to feed to livestock. If we humans ate it directly, we could get by with growing just 1/20th as much (animals are poor converters of calories), and we would be a lot healthier, as well, by avoiding the antibiotics and growth hormones and the grass fed beef tastes better and is more healthy...
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