Some of the world’s largest energy companies are saddled with their highest debt levels ever as they struggle with low crude prices, raising worries about their ability to pay dividends and find new barrels. The soaring debt levels are a fresh reminder of the toll the two-year price slump has taken on the oil industry. Just a decade ago, these four companies were hauled before Congress to explain “windfall profits” but now can’t cover expenses with normal cash flow. Executives at BP, Shell, Exxon and Chevron have assured investors that they will generate enough cash in 2017 to pay for new investments and dividends, but some shareholders are skeptical. In the first half of 2015, the companies fell short of that goal by $40 billion, according to a Wall Street Journal analysis of their […]