The world is more fragile today than it was in 2007. That’s the opinion of former derivatives trader Nassim Taleb, whose bestseller, The Black Swan, is about how people make sense of unexpected events, especially in financial markets. True to form, he made a whole lot of money after predicting the global financial crisis more than a decade ago.

Speaking with Bloomberg’s Erik Schatzker last week, Taleb said the reason why he has reservations about today’s economy is that it suffers from the “same disease” as before. The meltdown in 2007 was a “crisis of debt,” and if anything, the problem has only worsened.

Indeed, debt is on the rise. By the end of the first quarter, the total amount the world owes climbed to a record $247 trillion, according to the Institute of International Finance (IIF). That’s up almost $150 trillion over the past 15 years.

A lot of this debt, Taleb said, may have moved to different places since the financial crisis—it’s shifted from housing to governments and corporate balance sheets—but the debt “is still there.” Student loan debt in the U.S., for example, stands at about $1.5 trillion today, or nearly $33,000 per borrower. After mortgages, student debt is now the largest form of debt in the U.S.

Just look at the federal government’s balance sheet. Gross debt has more than doubled from pre-recession levels, meaning Washington now owes slightly more than the entire size of the U.S. economy.

Higher Debt Levels Pose an “Economic Threat”

President Donald Trump said last week that “we’re going to start paying down debt.” But all the signs appear to say otherwise. The Treasury Department estimates that it will issue some $1.338 trillion in debt this year—more than twice the amount as last year. And the Office of Management and Budget (OMB) recently reported that the government is set to run trillion-dollar deficits for the next four years, despite a roaring economy.