Raising meat and dairy are excellent options for marginal land, with one caveat; beneficial use requires sound pasture management. Trying to grow crops on marginal land is often very destructive.
Conversion of tropical forests into grazing land (or plantation/mono agriculture) is problematic. Those areas are far more productive using multi-story agriculture and/or swidden agriculture.
Eating a balanced diet that includes meat, eggs and dairy is better for the environment.
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