First published by Money Metals here: https://www.moneymetals.com/news/2018/03/01/gdp-increase-since-2000-001428

While official sources forecast U.S. Gross Domestic Product (GDP) to surpass $20 trillion this year, the real figure is probably much less. So how much less is real U.S. GDP? Well, that depends on how it is measured. If we factor in energy consumption and the increase in total public debt, U.S. GDP is likely less than half of the current figure.