The site is not the official site of those who made the documentary by the looks of it. The official site is http://earthlings.com/. So discounting the film because someone promoting it advocates veganism is probably misguided.
At for environmental impact, a meat diet is generally more environmentally expensive than a vegetable diet. Animals either directly eat vegetables or indirectly (eating other animals that eat other animals that eat vegetables, etc.). Through the life of the animal it's burning the calories from the vegetables. Eat the vegetable calories directly and you're not eating them through an animal conduit that consumed much of them while existing.
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The site is not the official site of those who made the documentary by the looks of it. The official site is http://earthlings.com/. So discounting the film because someone promoting it advocates veganism is probably misguided.
At for environmental impact, a meat diet is generally more environmentally expensive than a vegetable diet. Animals either directly eat vegetables or indirectly (eating other animals that eat other animals that eat vegetables, etc.). Through the life of the animal it's burning the calories from the vegetables. Eat the vegetable calories directly and you're not eating them through an animal conduit that consumed much of them while existing.