This is going to offend a lot of people, but if you had to choose the life of a human and a cow, which would you choose?
First, determine which is undisputably more destructive to its surroundings. Cows fart for sure; they contribute to the nitrogen cycle too but a lot of that flatulence can't be good for the environment.
However, a random human probably eats meat, drives a car that gets under 40 mpg and uses energy to power his or her house.
I'm majoring in anthropology right now (or misanthropology if you prefer) and one thing anthropologists stress is that one should not be ethnocentric, that is, one should not assume that a culture is superior to another's. It would be kind of hypocritical to be species-centric too, from that point of view, and that's what a load of humans are. There was a flood not too long ago in Houston in which 10,000 species of animals died in the basement. They were put there by humans.
On a side note, I don't believe eating meat is evolutionary. Early man actually had very little of it and was a scavenger. We have evolved to choose for ourselves, even if our instincts seek to force our hand.
No one has to become vegetarian. I'm presenting a side of the argument that is often overlooked, but in the end, I know the best thing for me to do is state my case and let people decide for themselves. But I do honestly believe going vegetarian could help out so much. For anyone with time, check out
http://en.wikipedia.org/wiki/Environ..._vegetarianism. There is a criticism section as well, to be fair.
Anyway, I didn't mean to make a public service announcement. For the record, I'm not PETA member and I don't agree with a lot of their beliefs. I don't equate havings pets to slavery, and I think they go about their marketing incorrectly. But I have very little sympathy for people who are starving and won't make the switch. What was the saying? "Beggars can't be choosers."
Global warming is a serious problem, but it's not our only threat. Nuclear weapons (designed by man), sentient technology, chemical warfare and last but not least, overpopulation are ever-present threats. Valenzetti equation, anyone?

for sure
Winehole, I will be sure to look into it. Thank you. I have about a month left of freedom, so this should be more than a worthy endeavor.