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plants that made your petrol (more likely animals that ate the plants etc) pulled the CO2 out of the atmosphere millions of years ago
During the dinosaur age, CO2 in the atmosphere dropped from about 2000ppm (lots, leading to 10-12C higher global mean surface temperature than now) to about 400ppm (about where we are now). I think the implications are clear - the climate change people are trying to avoid can best be avoided by reintroducing dinosaurs 🙂
Point being the food-plants pulled that CO2 out of the atmosphere last year and now it's going back. The plants that made your petrol (more likely animals that ate the plants etc) pulled the CO2 out of the atmosphere millions of years ago and if we didn't drill it up it would be still stored nicely in the ground.