[FairOpinion]

Very interesting.

Here is a potential technique to get more oil out:

US says CO2 injection could quadruple oil reserves

The United States, where oil production has been declining since the 1970s, has the potential to boost its oil reserves four-fold through advanced injection of carbon dioxide into depleted oilfields, the Department of Energy said on Friday.

The United States, the world's top oil consumer, has been successfully pumping small amounts or carbon dioxide into depleted oil and natural gas fields for 30 years to push out hard-to-reach fossil fuels.

The DOE said 89 billion barrels could potentially be added to current proved U.S. oil reserves of 21.9 billion barrels through injection of carbon dioxide, the main gas that most scientists believe is warming the earth.

[thegreatbeast]

The United States, where oil production has been declining since the 1970s...
It is more the cost of oil recovery that has decreased US oil production. Like everything else, using American labor became "too costly" and it made more sense to import oil. That happened in the 70s. We didn't exhaust our domestic resources.