you can and do breath carbon gases
Stick your head in a smoke stack and see how long that idea holds up for, or even just hanging out in some of the worse areas of China.
While technically many people would suffocate in an atmosphere which contained zero carbon dioxide (it triggers the breathing reflex when enough builds up in the lungs. You can breathe deliberately, but not while asleep.) excessive carbon dioxide is not breathable. Additionally, the majority of the producers of carbon dioxide are also pumping out hundreds of other pollutants into the atmosphere at the same time, the vast majority of which are very much not breathable. This is why people can die from being closed into a car where the exhaust system is leaking into the passenger cabin.
they're one of the few groups untainted by the widespread liberal pro-warming bias
Well, reality does indeed have a well known liberal bias.
[puts tinfoil hat back on]
Well, that'll help with the spying: http://slashdot.org/story/05/11/10/1839224/aluminum-foil-hats-will-not-stop-them
It's later than you think, the joint Russian-American space mission has already begun.