Don't worry about it. The earth has been through much worse in its time, ice ages, global droughts, too much CO2, too little CO2, it all balances out in the end.
Don't get me wrong, we're fucked. Always have been. It only takes a minor meteor strike or a super volcano and we're wiped out, but life will go on in some form or another.
If you're so worried about CO2 and the environment, then help me in my quest to burn up all the oil there is, 'cos the sooner we use it all up, the sooner "Mother Earth can heal herself and restore nature's harmony".
Besides, we recycle our milk bottles and old newspapers, so my concience is clear.