Natural gas production from U.S. shale fields can keep growing for decades, giving Washington a powerful diplomatic tool to counter the geopolitical influence of other energy exporters such as Russia, industry executives and government officials said at a conference here. Already the world’s largest gas producer, the United States can expand shale gas output another 60 percent in the coming decades, according to at least one estimate. So far, liquefied natural gas (LNG) has been spared from retaliatory tariffs in U.S. President Donald Trump’s intensifying trade conflicts with China and other countries. “We see a century of natural gas supply in U.S. shale,” Ryan Lance, chief executive of U.S. shale producer ConocoPhillips said this week at the […]