InsideClimate: A petition filed with federal agencies last week by a coalition led by the National Wildlife Federation is demanding a moratorium on pending tar sands pipelinesincluding the Keystone XLuntil regulators establish new rules to ensure their safety.
As if to illustrate the dangers outlined in the petition, Exxon's Pegasus pipeline that carries Canadian diluted bitumen, or dilbit, on Friday spilled in central Arkansas [3], releasing an estimated 84,000 gallons of the crude within about 45 minutes...