There aren't any fewer houses, cars, iPods, cans of Pepsi, and golf clubs in the world than there were a year ago (or if there are, it's just by chance).
This is what makes measuring wealth such a sticky issue. Even the most traditional measure, GDP, doesn't always account for wealth. For example, in the 1980s Haiti was able to raise its GDP by razing its forests and exporting lumber. What this overlooked was the fact that Haiti no longer had those forests and this was an unsustainable practice. Was Haiti actually any "wealthier" after they cleared all their forests? I think not.