) In the 20th century, the increased greenhouse effect raised global atmospheric temperatures by A) less than 1°C. B) 5°C. C) 20°C. D) 40°C. E) an insignificant amount.

) In the 20th century, the increased greenhouse effect raised global atmospheric temperatures by
A) less than 1°C.
B) 5°C.
C) 20°C.
D) 40°C.
E) an insignificant amount.

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