The calves are taken away from their mother after some days. You know it's very painfull to a mother when her baby is taken away. And it happens 1 time a year for each cow, otherwise they would stop giving milk.
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When I said raise your own I didn't mean start an industrial milking factory, or ranch for that matter. You can raise one or two of several different animals yourself, lots of people do it in rural areas anyway. Then any excess food you have can be sold or hey if you're so worried about hunger give it away for free!
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But when everyone would do that, there wouldn't be enough space and you still have the environmental issues.
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There is more then enough space, to put it in context if you took every human alive right now it wouldn't come close to filling the Grand Canyon at all. And please what environmental issues? Animal farts?
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How much food do you think all these animals need? How much space and water do you think this food needs? How much energy do you think it needs?
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Hemp seeds. Now shh xur time. End argument.