Carbon dioxide is not a pollutant.
The US’s Environmental Protection Agency proposal regarding power plants in the US. (Excerpt follows).
“Currently, there is no uniform national limit on the amount of carbon pollution new power plants can emit. As a direct result of the Supreme Court’s 2007 ruling, EPA in 2009 determined that greenhouse gas pollution threatens Americans’ health and welfare by leading to long lasting changes in our climate that can have a range of negative effects on human health and the environment”.
via 03/27/2012: EPA Proposes First Carbon Pollution Standard for Future Power Plants/Achievable standard is in line with investments already being made and will inform the building of new plants moving forward.