When did the ozone layer start thinning, especially near the poles?
A. the late 1950s
B. none of these is correct
C. the early 1950s
D. the late 1940s
E. the early 1960s
Answer (2)
Ozone layer thinning near the poles started gaining attention mostly in the late 1970s and 1980s, even though evidence of processes contributing to this thinning began in the early 1950s. The significant discovery of the Antarctic ozone hole was confirmed in the mid-1980s. The correct answer based on these details is B. None of these is correct.
;
The thinning of the ozone layer near the poles started to gain attention mainly in the late 1970s and 1980s, while the processes contributing to it may have begun as early as the 1950s. The issue is largely due to chlorofluorocarbons (CFCs) and led to global initiatives like the Montreal Protocol. The noticeable impacts, such as the Antarctic ozone hole, were confirmed around 1985. ;
