Strangulation. Cyanide poisoning. Low- voltage electrocution. Drowning.
If cells couldn't specialize, then the heart and other important organs would not function because if all cells did the same thing, the human would be one massive organ.
Absolute time is the answer
Zipper fracking is a new technology that produces more oil and more gas, safely and effectively, all from rock formations. Well drilling is another way, you get clean, natural gas by drilling into wells that connect into the ground. All that being said, we could also get chemical energy to be more safer, more usable, more efficient, and cleaner, if people were not careless with their work.