Always "who knows."
From a letter to the editor of the Roanoke Times:
I am certainly no expert nor very knowledgeable when it comes to drilling oil or even oil itself. What I know is this: Oil and water don't mix. Oil and life don't mix. Maybe we should have never started using oil. But, you say, we would still be in the days of the horse and buggy. No, it ain't necessarily so.Who knows?
Americans are terribly innovative. Just ask any foreign country. Our middle name is ingenuity. Who knows what would be powering our machines if oil did not exist?
The cold, hard truth is this: In the year of our Lord 2010 oil and human life mix in every imaginable way. From the computer the author used to write this letter to the clothing she's wearing right now (guaranteed), petroleum byproducts are an integral part of her existence.
And just as cold a fact is this: Ingenuity is not our middle name, oil is.
Like it or not, wish it weren't so or no, there's no escaping the reality of it.