I have heard some people counter ethical eating with "oh yeah? Tofu has a carbon footprint, too!" Of course it does. But please, supply some numbers.
The estimated carbon footprint of a pound of tofu: between .81 and .86 pounds of greenhouse gasses. The estimated carbon footprint of factory-farmed beef: 15 pounds.
Read more here.
Not that I'm going to become a vegetarian any time soon. My tactics are to eat more locally, more organically, and less meat, while my strategy is to cause as little harm to the planet as possible while still enjoying the experience of acquiring and eating food. As it should be, if the tactics don't support the strategy, I change them.