It is an atmospheric gas.
Why certain people and organizations think it is a problem is a mystery to me.
Using government to subsidize a product and/or eliminate competition by regulation has been a way to profit for a very long time. Hence, the major stockholders of the companies who stand to profit from this racket have been making fat donations to green groups for over fifty years. The NGOs and foundations launder the money and support the "scientific" justification they seek.
The “problem” is that there isn’t a one world government.
That’s the “problem with CO2”.