Why was the concern over global cooling replaced with a concern over global warming? a. the science community needed a cause to frighten the general population. b. steady surface temperature increases were noted between the 1970’s and 90’s. c. air pollution only became a concern in the 1980’s. d. scientists observed severe ocean acidification.

The correct answer is statement b.

Explanation:

A stable elevation in the surface temperature of the Earth was observed around the 1970s that brought the concern of climate change into focus. One of the prime influence of climate change is that it leads to global warming.  

Global warming is associated with greenhouse gases that trap heat on the surface of the Earth and lead to warming up of the surfaces. This can cause melting of ice in the Polar Regions, and thus increase the volume of water in the oceans.  

answer; polycythemia is the correct answer;

your answer should be c) enjoy!