it's an essential component of stars
Hydrogen, helium - oops - what's this he's trying to tell us? CO2 as well? He he he :)
(And the moon is made of cheese, right!)
it's an essential component of planets
Try living on Venus :D
you'll drop dead if you eliminate it!
We drop dead if we can't exhale it from our lungs. (Try holding your breath and not getting rid of CO2).
You can have too much of a good thing, you know.
