We'll really just have to wait and see if that happens. You're basing the latter on the expectations of the skeptical community; I don't share their optimism, though it'd be pretty darned great if it actually happens.
Believe it or not, though, there are actually people that think there isn't any warming occurring globally because a few weather stations are located near parking lots and air conditioners. Explain that to the birds who show up a week late for their food source during annual migration.
Would it be possible for you to tell us the ideal date and time for birds to arrive at their destinations? And has this always been the time and date on Earth or has it varied perhaps just a tiny bit here and there?