The problem is, oil won't double. A barrel will never again climb to 100$ because there are too many sellers on the market and interested fraction (US of A for example), who like to make good money but also need the liquid to be cheap. And the rest will be renewables. If oil goes too high up, investments flow into solar stuff.
Bottom line: The world has many problems, but the oil price isn't one of them, not anymore.
there is a good read for this called "zeropoint energy" and also the new agenda thats out, the one dated 11 years from now. I believe oil will be a super commodity in the future, basically only the richest can afford. Thankyou for the comments though and your welcome to keep them coming, we all need a good debate to stay sharp