Why do some people feel oil and gas pipelines are a good and necessary part of our lives, while others fight against them? To tackle this question, first we need to understand the basics: We all know what a pipeline is. But what they carry, where they are, and why there are so many, are questions most of us aren’t so sure about. In this first part of a series on energy pipelines, Barbara Lucas gives us a bit of “Pipelines 101," in "The Green Room."