Really? CO2 and not methane? Do you want to check on that and get back to me?400 ppm is 400 ppm. Are you saying that 400 ppm doesn't matter?
are you some kind of Christian retard.
Here's the thing. We can probably live with 400 PPM. But when it gets to 500 PPM or 600 PPM, then you reach a point of no return. At that point, the permafrost melts and all that biomatter starts rotting and creating even more CO2.