InsideClimate: Hoping to raise awareness about the Keystone pipeline he vehemently opposes, billionaire climate activist Thomas Steyer's campaign to block the project is ramping up and turning personal. His target? Russ Girling, CEO TransCanada Corp., the company trying to build the controversial pipeline. Steyer challenged Girling this week to a live public debate over the Keystone, an offer the company quickly rejected. The group Steyer founded, NextGen Climate Action, also unleashed an attack ad and tried...