fuel – n. any substance burned to create heat or power

environment – n. all surrounding things, conditions and influences that affect life; the natural world of land, sea, air, plants and animals

tradition – n. a ceremony, activity or belief that has existed for a long time

reduce – v. to make less or smaller in number, size or amount; to cut

predict – v. to say what one believes will happen in the future. (“The weather scientist predicted a cold winter.”)