Only we haven't restricted it to harmful emissions. Herp derp.
No, it isn't. That's where the debate sits today. Venus has an atmosphere comprised of 96% CO2 as opposed to Earth's 0.04%. Because of that, it reflects most of the energy from the sun. In fact, there is no difference in surface temperature between night and day because of this. So how is it that increasing concentrations of CO2 on earth is going to increase warming, even by minor amounts?
Maybe I should have mentioned Mars as well. It's atmosphere is over 90% CO2 yet its an ice block. Granted there are more significant reasons for that but with 90% CO2 it should be a pressure cooker (sarcasm).
CO2 isn't the problem or the major contributor to any global warming. If we are looking to our atmosphere, we can blame water vapor far more than CO2 for that. Time to classify water vapor as a pollutant....
Biff I have to clear up a few things because your post demonstrates a fundamental lack of understanding on how planets are warmed by the sun and the greenhouse effect.
Let's take Venus. The surface temperature of Venus averages 860F. Venus is farther away from the sun than Mercury, yet Mercury which recieves 3.5 times more energy from the sun than Venus has an average surface temperature of 800F.
Secondly the CO2 in the atmosphere in no way reflects sunlight. It is transparent. If it wasn't you'd be able to see it every time you exhaled. CO2 is however opaque to certain wavelengths of infrared or heat radiation which is why it is a greenhouse gas.
Without the greenhouse effect Venus does not receive enough energy to maintain its temperature or pressure.
Venus is the poster child for the runaway greenhouse effect as caused by CO2
As for Mars, it's a small world that's lost most of its atmosphere. It has less than 1% the pressure of Earths atmosphere let alone Venus. If you remember a cubic meter of hot dense gas has many more molecules than a cold thin gas. Mars simply doesn't have enough CO2 molecules to raise the global temperature even though the thin atmosphere is made of mostly CO2.