After chlorofluorocarbons were banned, which class of chemicals was used in their place? A. Carbon dioxide
B. Hydrofluorocarbons
C. Methane
D. Sulfur dioxide

What effect has the drug trade had on some governments in middle and south america? a. it has funded political instability. b. many nations have created democratic governments. c. many governments have allowed the drug trade to fund local programs. d. it has funded political stability.