I'm not concerned by it.
CO2 is an essential part of our biosphere. The more there is the better plants grow. CO2 is airborne fertilizer. There have been many instances in the past where CO2 levels have been far higher than they are now, and yet, the planet didn't die, explode, burn up, or whatever phrase they're using to scare little children with.
Want to do something about increasing levels of CO2 in the atmosphere? Then pretend it's Arbor Day and go plant some trees.