To be honest, I think humans need a good global smackdown. Whether that be in the form of catastrophic climate devastation, or the majority of people pulling their heads out of their ass to avoid it - either way. We (at least in America, and, I assume, other industrialized/budding nations) live wastefully, with little respect for our planet, other living things, or even each other. We've eliminated natural selection (short of something new emerging, which I'm sure will eventually), all but ensuring that the human race will only de-evolve from here (just look at who is having babies).
It's truly unfortunate that those in poorer areas of the world will, as they always have, get the short end of the stick if such things come to pass.
Anyway. Dead zones in the ocean, now. Only a matter of time. The good news is that if Peak Oil theories are correct, we won't have all that much more gas to burn anyway.