Human beings are infinitely resourceful, providing that their social, economic, and political structures support human innovation and enterprise. Particular physical resources may appear constrained in the short term, but experience demonstrates that people push back the limits. They find new supplies, they learn how to get more out of what is available, or they substitute different resources for the shrinking ones. There are numerous examples. The substitution of fiber optic cable for copper is an important one.
Petroleum is another obvious example.
All the while, new techniques of discovery and recovery have kept expanding known reserves, which are now higher than anytime in history. Oil is particularly interesting, because, unlike copper, which can be used over and over, it is not recyclable. Burning it for energy uses it up. Thus, supplies of oil are by definition finite, if a long enough time horizon is used, because their physical quantity cannot be unlimited. At some point the human race may well wring the last drop of economical oil out of the last piece of shale.