"Hyperloop plans revealed Monday envision a 'fifth mode of transport' in which passengers travel at extreme speeds through tubes to reach their destination. Elon Musk, chief executive of Tesla Motors and SpaceX, says the idea is 'extremely speculative.' But if Elon Musk's hyperloop is ever built, it could revolutionize transportation and energy."

"Crude oil shipped by railroad from North Dakota is drawing fresh scrutiny from regulators concerned that the cargo is adding environmental and safety hazards, something that analysts say could raise costs."

"The Federal Railroad Administration said it is investigating the safety of transporting crude oil by rail, including whether chemicals used in hydraulic fracturing are corroding tank cars."

"The Enbridge pipeline, converted from natural gas, would carry tar sands crude like the Keystone XL but is expected to easily win regulatory approval."

"OTTAWA — Faced with uncertainty over its proposed Keystone XL pipeline, which would link Canada’s oil sands with the American Gulf Coast, TransCanada said on Thursday that it would build a pipeline to eastern Canada."

"Climate change pollution from the airline industry is massive. Each plane that takes off emits about the same amount of carbon as 3,500 cars."

"Once black with oil, the Kalamazoo River runs clear now. But EPA orders dredging and says it will be years before the spill's long-term effects are known."

"VANCOUVER, Wash. -- Port of Vancouver commissioners voted Tuesday to approve a lease for a Columbia River terminal that would take in crude oil by train from North Dakota and ship it to West Coast refineries."

"The number of spills and other accidents from railroad cars carrying crude oil has skyrocketed in recent years, up from one or two a year early in the previous decade to 88 last year."