As far back as 1991, the Canadian arm of Exxon Mobil Corp.’s empire anticipated that a high tax on carbon emissions would be necessary to maintain a stable climate, newly released documents show. 

HuffPost reviewed the documents, which show that Imperial Oil ― Canada’s No. 2 petroleum producer, which the world’s largest publicly-traded oil company has long owned ― hired a consulting firm to model which price on carbon would deliver the emissions cuts officials in Ottawa were looking to impose.

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