I don't know, the same "we" you brought up first:
In the same way that the air we breathe, the leaves on the trees, and the sand on the shore is in such abundant supply that everyone can have as much as he wants at no cost. But yes, technically, the earth does have a finite supply of material, so does the solar system, and so does the whole universe.
To the contrary, I'm actually open to new ideas and innovations.