the limiting resource on our information economy is smart people's time. We don't suffer from a lack of raw materials. The only natural resource I can think that may be limiting economic growth is energy, and that is largely going to be solved with smart people's time.

Ok, so with optimizing the process of taking lemons from the tree with technology we can care less of the tree (resources).

But, at the end, the tree is the same, so we can stay X years more using more productive ways to consume this resources, but at the end we life in a limited world.

So isn't logical to thing that a neverending grow is impossible?

I think we have two ways, or stop growing, so we become a world sustainable or we find somehow to produce infinite resources.

no, soon we will find ways to travel to the next lemon tree (again limiting factor is smart people's time). We will experience a renaissance like we did when the New World was discovered and explored.