Scarcity

How do we define scarcity of resources? What about unexplored reservoirs and new alternate sources which would be identified later? Now, do you still believe in scarcity?

I think scarcity of resources is simply less than desired amounts of natural resources.

I'm not sure if unexplored reservoirs would redefine that as we will still want to consume it and the limiting factor is with the resource and driven by us. Alternative sources have the same rules. Sure, you can get that much more energy from 10g of uranium vs 10g coal (or carbon (depending on if you want to stick with pure elements)). The fact-of-the-matter is that they are both non-renewable. Our demands for energy have made them scarce resources.

I do believe in scarcity as long as there's an unreasonably high (numerical) demand for the supply (which cannot renew itself at an efficient pace).