== Methane == 

 There is a good faith addition about methane release. Unfortunately this is incorrect as the reference concerns release of methane from hydraulically fractured shale in the process of oil and gas produsction. However, oil-bearing shales like Bakken Formation and oil shale are different things (oil shale event not always a shale but it could be, e.g. cannel coal etc). The confusion is based on the fact that the term "shale oil" is interchangeable, as it is used as well for crude oil produced from shales of other very low permeability formations. However, for avoiding the risk of confusion of shale oil produced from oil shale with crude oil in oil-bearing shales, the International Energy Agency recommends to use the term "light tight oil" and World Energy Resources 2013 report by the World Energy Council uses the term "tight oil" for the latter instead of shale oil. Correspondingly, oil and gas-bearing shales are not oil shales.