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The American Recovery and Reinvestment Act injected almost nine hundred billion dollars into the U.S. economy to help the nation recover from the 2008 financial crisis. Ninety billion dollars went to clean energy, with the intention of jump-starting a new green economy and replacing aging fossil-fuel technologies. Instead, the stimulus may have done the opposite. Low interest rates, which made borrowing easier, encouraged a flood of financing for the young fracking industry, which used novel chemical techniques to extract gas and oil. Fracking boomed, and made the U.S. the leading producer of oil and gas, by some estimates. The financial journalist Bethany McLean and the investor and hedge-fund manager Jim Chanos tell The New Yorker’s Eliza Griswold that something in the fracking math doesn’t add up. They believe that if interest rates rise, thereby reducing the flow of cheap capital, the industry will collapse.