Pasteurizing does require energy, and ultra-pasteurization requires a lot of energy. Usually, smaller dairies do a less intense pasteurization that heats the milk at a lower temperature and in smaller batches. Then they sell locally, which usually means less packaging and less transport emissions. But to speak strictly about pasteurization: it does use energy (like just about anything) so it’s technically not “good” for the environment. But if the energy source is a clean one, it’s really not a problem.
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