fossil fuel – n. a fuel (such as coal, oil, or natural gas) that is formed in the earth from dead plants or animals

board – n. a group of people who manage or direct a company or organization

obligation – n. something that you must do because of a law, rule, promise

endowment – n. a large amount of money that has been given to a school, hospital, etc., and that is used to pay for its creation and continuing support

shareholder – n. someone who owns shares in a company or business