7. If we continue to ________ the countryside, many more animals will become extinct. A. destroy B. dump C. fertilize D. preserve 8. Fossil fuels have caused irreversible _______ to the environment. A. comsumption B. pollution C. damage D. preservation 11. The threat of global warming will eventually force the US to slow down its energy ___________. A. conservation B. destruction C. vegetation D. consumption 12. Supermarkets have recognized the increasing popularity of _________ food. A. organic B. inorganic C. gradual D. arid 13. The use of natural _________ can bring the crops on nicer than the use of chemical one. A. waste B. fertilizer C. threat D. disposal 14. _________ ecosystems release only small quantities of nitrate in streams. (POLLUTE) 15. The long-term dangers of land _________ from irrigation and chemical fertilizers are growing. (DEGRADE) 19. He is an _________ with a passion of the biology and geography of the region. (ENVIRONMENT)