So what? Green house games are the natural order of things and a gift to humanity.
Green house gas.
Thought everyone would know by now, but CO2 is not a pollutant. It makes folliage green & at least some of the green stuff creates oxygen. Now, the smoke from all the coal burners in China...well that just might have something to do with air pollution. Not sure if they are set up to use any scrubbers or not, but from what I read I doubt it.