Gov. Rich Perry (TX) says that greenhouse gases aren't harmful to humans. Okay, Gov. Perry, I'll accept your argument if you can survive in a chamber filled with 98% CO2 for ten minutes. Do that, and I'll say you have a point. Hey, you should be able to hold your breath for at least three of those minutes. And, yeah, I'd like independent verification. I'll bet the Guinness people would be willing to observe and time it for you. It would be a record worthy of their record book.