Why we should take notice of what Exxon says about energy in 2050

The Big Oil behemoth has been right in the past, though it hid the truth.

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In the past few years, as we have reported,  several U.S. cities and states — including Oakland, Calif., New York, Annapolis, Md., Charleston, S.C., Honolulu, Minnesota, Delaware and Rhode Island — have sued Big O…