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not normally a huge fan of Maher, I'll have to say he hit the nail on the head with this one.
It probably depends on what's added to the calculation. There are many hidden environmental costs in meat production. I didn't see any mention of the vast amounts of fossil used to grow industrial feed corn or to cart animals from pasture to feedlot to slaughterhouse to grocery store.
It's articles like this that are why I won't be renewing my subscription when it runs out.