The environmental effects of pipelines are all we hear about these days, but these iron conduits have a very substantial impact on oil prices. In this video, Fool contributors Aimee Duffy and Tyler Crowe discuss these effects, highlighting the current problem that mid-continent refiners are facing with the collapse of the Brent-WTI spread.

Fool contributors Aimee Duffy and Tyler Crowe have no position in any stocks mentioned. For more energy information, follow them on Twitter, @TMFDuffy and @TylerCroweFool.

The Motley Fool owns shares of Western Refining. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.