What convinced me that there’s something real about peak oil predictions were Chris Martenson’s interviews of professionals in the field who don’t believe what Martenson says; i.e., these skeptics believe that other sources of energy will be found. It was precisely the arguments presented by Martenson and the very friendly discussions in his programs with the skeptics what convinced me that those who debated him were wrong.
For beginners to the debate see Chris Martenson’s 45-minute Crash Course:
Some energy researchers are fearing that, by the end of the century, 5 billion humans will die of unnatural deaths (malnutrition, starvation, disease, civil war, etc.). These surplus of humans are the direct result of a deranged use of oil reservoirs.
If you believe in social entropy you know that when a System disintegrates another system starts to integrate at the same time. The best example that occurs to me is the city of Constantinople, which flourished when Europe fell into utter chaos, with native Europeans becoming very few by the sixth century.
Something similar will probably happen in our century.