Animal Suffering in a Factory Farm

We don't really have a well developed community of people who are both in touch with the background moralp and interested in applying it to the real world. We need to think about, suppose that the world were destroyed? Is is, what's so bad about that? The fact that seven and a half billion people have lost their lives, and that's the end of them? Another issue, i think, is how do we get a grip on a the nature and extent of animal suffering? Something will be talking about it ment but it's really very hard to say.