In an effort to allow all to live longer we develop drugs and medicines that allow the weakest genes to continue. We produce "super bugs" by piling on the antibiotics. We kill off pesky and harmful insects with chemical and create other kinds of super bugs. We try to defy mom nature but we always lose the fight with her because she is so patient while we are not. There was a time when carbon was being deposited in the ground as life died off rather rapidly. But, prior to that, the atmosphere was heavy with CO2 though man hadn't been around to fracture the eco-system. Mom nature was charging up a battery for us. We are now using up that charge. When it runs out, mom could do it again. We could come back as gasoline in the tanks of future vehicles. The cascade is on the way.
From a coal site "Complete combustion of 1 short ton (2,000 pounds) of this coal will generate about 5,720 pounds (2.86 short tons) of carbon dioxide."
http://www.buildinggreen.com/features/flyash/appendixa.cfm and other sources cite 1 ton of concrete causes 1 ton of CO2 emissions.
Lesson. Everything we do seems to emit gas.