I am not certain on this answer but I would say Rochefellar Family. Granted, they have had their hands in not only oil, but also banking and politics. The family is very wealthy becuase in the late 19th and early 20th centuries, the family made one of the world’s largest private fortunes in the oil business, through Standard Oil Company.The family has been a major supporter of land conservation. They have created more than 20 national parks and open spaces.
Also, Roman Abramovich is a very healthy man, deriving his money from oil–export deals in 1990s. He is worth 13.3 billion.
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