How do they release it back? A process that takes a few hours (burning) or a process that takes years? How did the hydrocarbons get in the ground in the first p

How do they release it back? A process that takes a few hours (burning) or a process that takes years? How did the hydrocarbons get in the ground in the first place? You can't be serious with "something that would not decompose". Entropy literally disfavors it. The point is to tamper the rate, not to completely turn all C into diamond and jettison it into the sun.