That sounds like a non-sequitur to me, Joseph. How does being given the earth translate into killing animals for appearance? Would you also say that hunting or bull-fighting is permissible under the same grounds? I agree that Hashem gave us the planet, but along with that comes a responsibility to treat it well, the same way that Hashem have us our bodies, but we are not permitted to do whatever we want with it just because it’s ours (i.e: tattoos, smoking, etc…). And what about tzar balei chaim? Doesn’t that come into play?
