Yes, that's why it is that hot on Venus.... no one here is saying that will happen on Earth. That was only an example to show the power of CO2 in holding heat in.
You know what the world temp. be if we doubled the CO2? Go read a book and find out, you won't be happy by what you find.
And also, if you like to think that just because the amount of CO2 is <1% that CO2 doesn't dominate our world? Look many plants cover the world... ya know what they take in to breathe? Doesn't take a lot of the stuff man.
I used the term double because I figured it was such a truely ridiculous notion that anybody would recognize it as absurd hyperbole. Apparently not.
We are incapable of significantly altering the content of our atmosphere.