InsideClimate: The ongoing U.S. oil boom has flooded the Gulf Coast with domestic crude to levels not seen in decades, creating a homegrown oil glut in the nation's refining center just as the Obama Administration prepares to rule on a pipeline that would add a torrent of heavy Canadian crude to the same region. It's just the latest in a string of developments that have surprised and roiled oil markets since 2009, when the combination of falling fuel demand and an unexpected surge in U.S. oil and natural gas production...