If it was proved tomorrow that plants can feel pain, what would happen to the arguments of vegetarians who are vegetarians because they don't believe in causing animals pain?

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Well, if that were the argument one had used, one would be in a bind. But I doubt many people are vegetarians for that reason. Nonetheless, most people, vegetarian or otherwise, think it wrong to cause animals unnecessary suffering. If it turned out that plants (say, grasses) feel pain, then I take it most people would be in a bind.

Fortunately, there doesn't seem much prospect that organisms with no nervous system (let alone a central nervous system) feel pain.

The main way we cause pain to aminals is through the way we raise them in factory farms, so even if plants could feel pain (though like Richard, I bet they don't), we might be able to grow and harvest them without causing them any more pain than, say, we cause a free-range chicken. But if forcing them to grow in those straight rows causes them severe and prolonged distress....

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