There are alot of projections and tipping points. Below is a good article on the topic. What really burns me, ha ha, is the resistance to seeking, using, alternative energy. I believe that we should end the subsities that Oil gets and give it to all the alternatives. Sure it is painful now - but so is being held hostage by dictators. A mixed solution of Solar,Wind, Wave, Nuclear, Bio etc... is continually proposed and loses all of its momendum because it costs more then Oil, but what is the real cost of our dependance? Add the ME wars to the price of a gallon of gas as a war tax @ the pump and we will be driven away from oil! We, mankind, tend to wait till the crises is upon us before acting, rather than avoiding it and taking the actions years ahead to avoid it. Seems pretty stupid to me.
End of Cheap Oil @ National Geographic Magazine
Cheers