Carbon dioxide is actually the most naturally occurring gas for terrestrial planetary atmospheres. The Solar system has three terrestrial planets with substantial atmospheres two of them Mars and Venus have predominately carbon dioxide atmosphere. Even Earth would have a nitrogen / carbon dioxide atmosphere if it were not for plants producing lots of free oxygen. So once again carbon idea of dioxide being a pollutant is absurd.
You may be asking about climate change or global warming or what ever the latest term of the week may be? Well if you ignore the fact that the computer models used to support man caused global warming make the thermodynamically impossible assumption that as the global temperature raises the amount of heat lost to space is reduced. If you also ignore the Climate Gate emails that show that climate data has been manipulated.
If you ignore all this and take the proponents of global warming at their word, they are only predicting a rise in temperature comparable to that of the Medieval Warm Period. The Medieval Warm Period was actually beneficial allowing the Vikings to reach
America and helping Europe recover from the black plaque and producing increased food production and prosperity. So once again carbon idea of dioxide being a pollutant is absurd.
Now the question is why did the EPA take such a ludicrous step? The answer is Cap and Trade. President Obama could not get congress to pass Cap and Trade; a scam that would enrich those behind the plan at the expense of the