Reuters: The Keystone XL oil pipeline would be vulnerable to attacks threatening water supplies for millions of homeowners and farmers, according to a report by NextGen Climate, a political group led by billionaire activist Tom Steyer. Attackers could wreck remote pump stations along the pipeline's route in the northern Great Plains with just 4 pounds (1.8 kg) of readily available explosives, Dave Cooper, a former Navy Seal and a senior operative on the mission that killed Osama bin Laden, said in the 14-page...