Hubberts methods have been thoroughly discredited from several angles. Would you like a reference?
Yes I would like a reference please.
Sure. We'll start with an easy one.
Cavallo, A.J., 2004, Hubbert's petroleum production model: an evaluation and implications for World Oil production forecasts, Natural Resources Research, Vol. 13, no. 4
Basically, Hubberts method will predict a URR for the US between 200 and 600 billion barrels with the same statistical goodness of fit measure. Phrased another way, you can honestly pick any line through the data you'd like as long as you don't mind an error bar of 3X, at a minimum. Cavallo didn't test outside those bounds.
So, when we apply the same method to the world, our error bar can range all the way up to 6 or 9 billion barrels for URR without any issues at all. Little bit higher than peakers are claiming right now, ain't it!
Hard to build a peak at the halfway point when the halfway point could be another 60 years down the road, eh?