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.”)