The over-population of Earth, in modern time, was first proposed late in the 18th century [1798] by English clergyman and economist, Thomas Robert Malthus. That's like asking a plumber for legal advice, or vice versa. Point is, he's not educated in the field of his claim. Nor was polititician, AlGore, with regard to "an inconvenient truth" which turned out to be false, as Mark Twain once quipped: "It ain't what you don't know that gets you into trouble, It's what you know for sure that just ain't so." At the dawn of the 19th century, Earth's human population was estimated to be 1 billion. Earth's total landmass is estimated at 149M km^2; about 29% of the total surface of Earth. Now, on that same landmass, the population is 8x of that counted in 1800. And still, all 8B of us could be accommodated with 1.5 acres, each, just on the total segment of landmass that is agricultural [38%] and arable [idle agricultural land - 11%], 49% total. leaving all urban, meadow, arctic, desert, and mountain landmass [51%] totally unpopulated. We are not overpopulated, we are poor land managers.
Peak oil [a predicted maximum availability of oil worldwide] was predicted in 50s by M. King Hubbard, a geologist [at least in the right educated field] to occur in the mid-70s. It didn't happen, and has yet to happen even 50 years later. He assumed [as is still assumed] that petroleum crude is a finite resource that will eventually be depleted. Who says? By what measurement? The resource is organic life - animal and plant, gone to ground by death. Being organically supplied, why should the resource be finite? Who or what will be responsible for ending the natural process of petroleum crude production, since the material supply will endure as long as life in abundance occurs on Earth, and dies? And who has measured the production time? We guess millions of years, but who measured, and with what measurement tool? We do not actually have an empirically derived answer of product manufacturing time. Further, tell me what other naturally occurring process has just quit as petroleum crude has allegedly quit? Water? Air? Nope. Anything else? Nope.