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. 

This was in the early 1990s, when awareness of global warming had started to go mainstream and talk of regulation seemed to be increasing. An that then-chief executive A.R. Haynes signed showed it would take a tax of “$55

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