Our biological resources and ecological systems, sure. Earth's inner core is literally a molten ball of iron and nickel. Earth crust contained plenty of minera

Our biological resources and ecological systems, sure. Earth's inner core is literally a molten ball of iron and nickel. Earth crust contained plenty of minerals, including elements like silicon and oxygen. Now, we could go full hog on population growth, assuming no ecological issues. What we might run into is the problem of heat dissipation. Humans are basically 100 watts space heaters. Never mind all the infrastructure needed to support a human population. How much can we produce before there's too much heat? Producing steel is a heat intensive process.