The EPA position has been, since the Reagan era, that since CO2 is naturally occurring in the atmosphere, it is NOT a pollutant. It has been a marvelously Jesuitical position. I don't think courage is involve. They are afraid of Obama and the people he will bring with him.

CO2 is like vitamin A. Not enough and you die. Too much and you die. But within a certain range all is well. We are already above the level of the healthy range (300-350 ppm).