Relax!

According to this study, when atmospheric CO2 gets very high and temperatures go up, the amount of CO2 absorbed by the earth increases, so that the planet can recover from a CO2 spike in just 30,000 to 40,000 years. So you can stop worrying about all that carbon we're putting in the air; it will all be absorbed in less time than it took our species to progress from the first cave art to space travel.