You're jumping to some big conclusions there, I believe the exact opposite in fact. The IPCC report is always overly conservative and it's gonna be much worse than anyone thinks. Those birds are already dead, as well as most of us cause there's no convincing people to stop driving diesels for two hours every day and flying halfway across the planet for a vacation. I've stopped caring. Burn all the gas you want, blow up as many missiles as you like, it won't make much difference in the end.
I bet some emus will survive though, tough bastards.