Because Congress won't let the absence of a problem stand in the way of grand solutions, the US oil and gas industry faces new threats to its ability to manage risk.Responding to spectacular financial failures of 2008, Congress this summer passed, and President Barack Obama signed, a bill that will impose new limits and possibly large costs on tools producers use to protect themselves against harmful oil and gas price swings. A logical question to ask is how those tools contributed to the financial failures. They didn't. But the limits and costs are coming anyway.In a report late last month, the law firm Mayer Brown explained how the Dodd-Frank Wall Street Reform and Consumer Protection A...