I know that oil and tungsten are materially different from fish. Marginal costs of digging things out of the ground does in fact tend to increase gradually with scarcity, as do incentives to devote resources to basic research into recycling, consumption reduction, and alternatives.
But teaching undergrads about tungsten and not fish is just propaganda.
Edit: To be clear, the point is not that my professor was idiotically wrong about oil and tungsten specifically. The "idiotic" part is to assume and furthermore imply to young students (who don't know any better) that the general principle holds equally well in all domains. Maybe "arrogant" would be a better word than "idiotic".
