The U.S. is exporting of its oil. An embargo could happen any minute. There are reserves of 990 billion barrels and another 550 billion barrels of undiscovered oil. Tar sands and oil shales are difficult to extract oil reserves. These would increase the reserves.
Natural gas is essentially oil that has been cooked to a higher temperature.
It has long been overlooked, but provides a very clean alternative. Less CO 2 produced, no sulfur, no waste. Renewable resources are those that replenish themselves at the same rate that they are used. Examples are farming, where we make what we use, and continue to do so. We are not using more than we make.