Natural gas that is, in referring to a Stanford study published in Science.  Though natural gas has been sited as having the advantage of not letting off carbon dioxide, it has been noted in the study that use of natural gas does let off methane- which is not a good thing in terms of green house gasses.  You can read more at http://www.alaskadispatch.com/article/20140215/study-climate-benefits-natural-gas-inflated.

 

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