They demonstrate against Keystone XL pipeline proposal
                                
                                
                                    (Newser) -
                                    More than 8,000 environmental activists descended on the White House yesterday, forming a human chain to protest a 1,700-mile pipeline that TransCanada Corp. wants to build through six states, from Canada to the Gulf of Mexico. Unlike  August's protests, when 1,200 were arrested , there were no...