We’ve heard a lot about the Keystone pipeline these past few years — which, if approved, would carry oil from the tar sands of Alberta down to refineries in the Gulf Coast. Supporters say the pipeline will improve U.S. energy security. Environmentalists say the tar sands will prove disastrous for global warming.

That debate can get a bit abstract at times. And so, to make things more concrete, my colleague Steven Mufson decided to take a road trip last summer down the length of the proposed Keystone route, from Alberta to Texas.

He’s written the whole trip up in an excellent new e-book “Keystone XL: Down The Line.” The book is a fairly quick read and really offers a fascinatingly detailed look at many of the issues raised by the pipeline. It’s highly recommended for anyone interested in energy and environmental topics.

Here are seven interesting things about the Keystone XL pipeline I came across in the book — though keep in mind there’s a lot more in there: