They're essentially unlimited. They make up 68ppm of the Earth's crust. If we used all of that to make stuff, we'd run out of room to put the stuff before we'd run out of rare earths.
(We also came very close to running "out of" ozone over a large part of our planet. The idea that a resource is "done" only when it's been utterly depleted isn't how it goes in practice.)
>Whenever a resource becomes scarce, incentives drive technology to find better alternatives, we move towards abundance at each iteration.
The denial is strong in these ones...
"Hey, it worked in the past, when the population was 1/100th to 1/4th (start of 20th century), industrial production and consumption was 1/10000th was it is, demand for most modern necessary resources zero, and so on, so should work in millenia to come. And if not we can always pull a pivot to an alternative resource out of our magic hats, because 'science'".
Funny thing about that idea is if it was true our best option would be to ban oil extraction as early as possible and just wait for the unavoidable innovation to take place and bring us to the next level of abundance.
For a limited resource.