You know, mankind has this wonderful, adorable trait which I call, Egyptian River Mentality. This trait is simply that mankind cannot believe in and cannot even worry about a natural disaster that has not occurred in a long, long time--if ever.
We don't worry about black holes slamming into our Sun.
We don't worry about giant comets slamming into the Earth. (well, not much)
We don't worry about mutant army ants eating all other animals on Earth.
We don't worry about mutant viruses killing half of mankind. (maybe we should)
And we definately don't worry about having so many humans on Earth that we kill all the other animals and pollute ourselves into near-extinction.
Hey, it's never happened before!

What're the odds????
Egyptian River Mentality. Living in Denial.