ADN by Alex DeMarban.  On Thursday, as part of an effort to increase transparency, Exxon flew journalists to see the largest development underway on the North Slope: the $4 billion Point Thomson gas field near the fiercely protected Arctic National Wildlife Refuge.  ...   The Exxon official who has managed the project the last five years, Sofia Wong (NGP Photo), told reporters on the media tour why Exxon was investing so much in what she considers “the middle of nowhere.  “The answer is we have a world-class reservoir right under our feet.”   [...]