Question

7. Place the year next to each event related to the history of ozone depletion. 12 pts Your choices are: 1930s, 1960s, 1974, 1977, 1977, 1987, 1990s. a. Chlorofluorocarbons (CFCs) are invented and used as propellants and refrigerants by people worldwide. b. The United Nations meets and adopts the World Plan of Action on the Ozone Layer. c. The Montreal Protocol on Substances that deplete the ozone layer is signed and ratified by countries worldwide. d. F. Sheerwood Rowland, Mario Molina, and Paul Cruzen discover that CFCs are a major cause of stratospheric ozone depletion. e. The US and Canada ban the use of CFCs in spray cans. f. Production and use of CFCs and other ozone depleting agents dramatically decrease.

Answer 1

The depletion of ozone layer is largely a result of man made substance like CFCs.

(a). Chlorofluorocarbons ( CFCs) are invented and used as propellants and refrigerant by people worldwide in 1930s

(b) The Unites Nations meets and adopts world plan of action on the ozone layer in March 1977 at Washington DC . It was the first international meeting to address the issue of ozone depletion and the meeting was held by United Nations.

(e) The Montreal protocol on substances that deplete the Ozone layer. | 1987 d) F. Sheerwood Rowland, Mario Molina, and Paul Cruzeno "discover thout CFCs are a mayor cause of Stratoscopie Stratopherie Ozone depletion. 1974 ey The US and Canada ban the use of CFCs and other ozone depleting agents in non esential uses. (1977) f) Production and use of CFes and other ozone depleting agents dramatically decreased. 1990s) CS Scanned with CamScanner