if you have any convictions, don't get it. the fiziks, as mentioned, come in synthetic options, as do the specialized body geometry saddles (which are absolutely amazing. i love my alias). the only reasonable arguement that can be made for a vegetarian or vegan to own a brooks is that they last forever, thereby reducing waste, and that there is no plastic, so it's better for the environment. but i'd have to say that cows are more detrimental to the planets well being than mining. (that's right, i'll argue that)
and whoever said to just eat a hamburger and get the saddle, shut the **** up. that isn't helping anything.
and how does meat being delicious have anything to do with a saddle? do you chew on your saddles? cause i don't.