The truth is that, once resources become scarce, various optimization mechanisms kick in. For example, Israel produces a lot of food in the desert thanks to various water usage optimization techniques.
Human civilization uses a tiny percentage of the total energy delivered to Earth. This again is tiny percentage of power generated by Sun. There are abundant resources all around us that we simply need to learn how to effectively utilise. This is not sci-fi stuff, these are "merely" engineering problems.
The challenge is to get to that "post-scarcity" (or whatever you call it) future sustainably, without killing ourselves or making Earth a toxic hellhole. This requires cooperation, but you won't get that by going around and claiming falsehoods or persuading people with fallacies.