Question 5:
Which most accurately describes the effects of Global Warming in the United States over the last 100 years? a) temperatures have risen > 5° C b) temperatures have risen > 2° Cc) temperatures have risen < 1° C You are correct!
Which most accurately describes the effects of Global Warming in the United States over the last 100 years?
a) temperatures have risen > 5° C b) temperatures have risen > 2° Cc) temperatures have risen < 1° C
Temperatures have gone through nearly two complete cycles of warming and cooling over the last 100 years. During the period 1900 to 1940 temperatures were increasing. Then from 1940 to 1980 temperatures were decreasing. Currently, temperatures are increasing back to about where they were in the 1930's.
Overall, the total average annual temperature increase in the U.S. in the last century is so slight the actual amount is uncertain-- maybe 1/3° C.