Perhaps it isn't that harmful right now but according to people that monitor it, the concentration is climbing and it's almost doubled in the last 200 years.Oh yes we can and do pollute the air.
How high a concentration are you talking about? If you go high enough, anything can harm, even oxygen can be toxic. But the little bit of CO2 that's currently in the atmosphere? Not to worry.
RealClimate: The Acid Ocean – the Other Problem with CO2 Emission
So even if the stuff doesn't affect the climate that much, it (along with SO2 and other pollutants) sure as heck affects the oceans.
Right. I've seen pics of LA's air on a bad day. Or how about Mexico City these now?I'm old enough to remember the 60s. We weren't near that bad.