Question

24 Many scientists accept the theory that excess emission of carbon dioxide from cars and industry causes a layer of gas in the upper atmosphere that traps heat. This, in turn, causes the average temperature on Earth to rise. Which observation supports this theory? A The summer of 1998 was one of the hottest summer seasons on record. B. Carbon dioxide gas from cars and industry is a product of burning that produces heat C Carbon dioxide in the upper atmosphere reflects heat radiated from Earth's surface. D. Radiation on Earth's surface is increasing because of a hole in the ozone layer,

Answer 1

The summer of 1998 was one of the hottest summer seasons on record.

This observation supports the theory.

Thus, option A is correct.