One of several problems I have with RexDart’s attitude is, how do we KNOW what’s necessary to our existence? After all, we’ve never lived in a world where species X, which might go extinct tomorrow, has been extinct. Sure, we’ve lived fine without the passenger pigeon and the dodo, but why tempt fate any more than we need to? And that’s not even counting the ones that might not be necessary, but would make our existences a lot easier (ie the old medicinal argument extended to plants).
Plus, some species might not be necessary, but so what? There are plenty for which we’d have a poorer world for their passing, in a non-survival sense. The lions of the Serengeti, for example, might not directly affect life in America, but not having any would be a tragedy, IMO. I realize that this might not touch the hearts of many people, and it’s not something that can be explained in logical terms, but heck, we don’t NEED cats or dogs either, do we? Besides, in the case of lions, how do you think many African nations would react if their main source of tourism, the animals, up and vanish?
Also, there’s the fact that the very reasons many species go extinct mean ecological damage that have a very good chance of harming US, such as deforestation and climate change. Further, a lot of the REASONS that these things happen are due not due to some noble pursuit of being human, but completely undesirable traits of humanity that, again, could very well come back to bite us in the ass (widespread poverty which leads third world nations to cut down rainforest, sheer greed that leads to animal poaching, carelessness and corner-cutting that cause oil spills). Why would we want to defend and pursue those traits and circumstances? Why shouldn’t we try to prevent these things?
Anyway, this is a very poorly supported and illogical post, I know. Just tossing out a few initial thoughts.