Question

Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?

a. Pollution began reflecting sunlight and heat rather than absorbing it.
b. Evidence of global warming became overwhelming.
c. Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.
d. Congress required scientists to assign a cause to global climate change.

(Not A)

Answer 1

The correct option is B.
The field of science is very dynamic and it thrives on discovery of new evidences. When new evidence are found for a particular phenomenon, the existing phenomenon has to be adjusted to fit the new discovery. Air pollution was once named to be responsible for global cooling because enough evidence was not available then to prove otherwise but now overwhelming evidences show that pollution is responsible for global warming.