Between 1940 and 1970 most scientists were already concerned about global warming. select the best answer from the choices provided t f

False.

Explanation:

Until 1970, many scientists thought Earth was starting a period of global cooling and there was data gathered that seemed to prove that Earth had experienced significant cooling from 1940 through 1970.

As a steady surface temperature increase was noted between the 1970s and '90s, the attention over global cooling was substituted with concern about global warming.

The air pollution that had been blamed for global cooling is now known responsible for global warming.

the correct answer is c.