America's natural gas bounty is acting like a moat, largely shielding the U.S. from price spikes while much of the world reels from escalating unrest in the Middle East.Why it matters: Natural gas hasn't, historically, drawn the same headlines as the more volatile oil markets. But it's increasingly central to the economy — including powering the AI boom.Yes, but: The moat isn't impenetrable. And if substantially more American natural gas gets exported, it could raise heating and electricity bill...