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"milk cows you have to feed them more so they produce more milk"

how much more ? what kind of food? where does that food come from? more importantly, how many people on the planet can sustainably drink milk and still have habitat for wild places, for forests, for clean water? who gets to decide who does and doesn't get to participate in the spoils of the earth? and what about the fact that the cow is not going to produce milk unless the are impregnated. what happens to the calf? what if the calf is male and cannot be raised for milk?

dig deeper.