It'd be hard to argue in favor of the existence of some objective problem with doing this. I only think 'irreverence' applies to human remains when it does damage to the person's living relatives and goes against their wishes.
Anyway, I don't plan on dying if I can manage to avoid it, and I think that, provided I live into the late eighties or so and the human race doesn't extinct itself in the meantime, I probably won't have to. But I'd want an environmentally friendly burial if something happened before that.