Well, there's an argument to be made that any economic system founded on limitless growth is effectively a Ponzi scheme. And Western economics for the last thirty years or so expected limitless growth.
Growth does not have to be based on population growth. Increasing resource efficiency causes massive growth in per-capita wealth and therefore in aggregate wealth. I can't find any figures but by my own analysis I'd say the Industrial Revolution ultimately increased the per-capita wealth of the citizens of the industrialized countries by a factor of at least one hundred and possibly one thousand or more (using uninflated units of measurement). That increase is the manifestation of the growth in production of a healthy economy.
The Information Revolution is going to do the same thing, and in fact has already started. I had twenty LPs when I went away to college; look at the size of the average teenager's iPod music library today. Sure, much of it was probably duplicated clandestinely, but it's still wealth and the economy will eventually invent new ways of paying for new kinds of "production."
Our cars represent far more wealth than my 1951 Chevy, with all of the new features made possible by information technology such as antilock brakes, air bags, solid-state ignition, computer-crafted suspension and aerodynamics, reduced fuel consumption, and memorized seat shapes. Same for our kitchens, our hobbies, our TV, our communication, everything in our homes. And outside, such as medical care of nearly Star Trek scope and an increasing percentage of jobs that can be done virtually, without "going to work." I'm far wealthier than my grandfather was at my age, even though I'm at roughly the same percentile on the national income curve.
We're using resources more efficiently due to the Information Revolution. Not only is it helping us reduce the consumption of traditional resources in many ways, but information itself is a new type of resource that is, almost literally, "too cheap to meter."
So yes, the world economy can continue to grow without necessitating the continuation of the death spiral of population growth.
What goods and services does the US produce besides scrap metal?
If you read this far then I'm sure you figured out that the new market in goods and services is virtual. I'm something like forty years older than you and I can see the Paradigm Shift to a post-industrial economy clearly. You young kids are right smack in the center of it.
Which computers are made in the US?
Whoever said that didn't get the words right but he caught the spirit. We're producing information, which includes software and all virtual commodities, and will be shortly (if it isn't already) a far larger chunk of the economy than the hardware.