To be fair, I believe there's a responsible way to consume meat. Fish, for example, are much less strenuous on the environment, and almost any animal you take out of the wild is going to be environmentally fine (as long as it's not on a massive scale, which is why this position won't work for the vast majority of people). Deer, for example, have almost no remaining natural predators, since we've done a good job wiping a lot of them out. It kind of falls on human beings to be the apex predator and make sure that their population is manageable so we don't get huge disease outbreaks like this one. To this extent, I feel comfortable from an ecological perspective killing and eating deer--in fact, killing a few of them yearly is not only good for the environment, but usually gives me enough meat to last until next year.
