[TruthFactor]

https://alfinnextlevel.wordpress.com/2018/04/16/still-waiting-for-peak-oil/

The western U.S. alone contains at least 2 trillion barrels of petroleum in oil shale formations. At a current U.S. annual consumption rate of 7.2 billion barrels, that’s a 278-year supply.

[The Truth Will Make You Free]

I recall reading about this in 1969 at the start of the environmental movement. There was also no known way to extract the oil.

I’ve not read what percent of available share oil fracking extracts. It can’t be 100%.