ThinkProgress: After countless marches, arrests, Congressional votes, and editorials, the five-and-a-half year battle over the controversial Keystone XL pipeline is nearing its end. If a recent ruling in Nebraska doesn`t delay the decision further, America could find out as soon as this spring whether or not the pipeline, which has become a focal point in America`s environmental movement, will be built. But while critics and proponents of Keystone XL have sparred over the last few years, numerous pipelines - many...