The speculation on whether Ghawar can yield a lot less oil than most people think has been around for more than a decade. People used to worry about this stuff

The speculation on whether Ghawar can yield a lot less oil than most people think has been around for more than a decade. People used to worry about this stuff a lot more, back when it wasn't clear whether heavy oil and shale would be able to fill the gap (not to mention renewables).