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Most positive effects on the planet but not humans?
Cattle, they're a major source of greenhouse gasses, as are all the industries built around growing, processing, and transporting them.That would be such a boon for the planet. The biomass of cattle (that is, if you piled them all on a scale and got their weight) far surpasses the biomass of wild mammals. All wild mammals, land and sea, combined. (They're only about 4% of total mammal biomass.)
Cattle, and the things you describe, are the result of human intervention...
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