In terms of long-term temperature increases in the atmosphere, which of the following is TRUE?
A) Average global temperature has risen 5.0°C the 20th century.
B) No changes have been observed in this century.
C) The greenhouse effect has never been shown to be real.
D) Increases in greenhouse gases have been observed.
E) It appears that we can readily curb the carbon dioxide problem.

Question

Quizplus · Accepted Answer

Increases in greenhouse gases, such as carbon dioxide, have been observed and are contributing to long-term temperature increases in the atmosphere. Option A is incorrect as the average global temperature has not risen 5.0°C in the 20th century, although there has been a significant increase. Option B is incorrect as changes have been observed in this century. Option C is incorrect as the greenhouse effect has been well established by scientific evidence. Option E is incorrect as curbing the carbon dioxide problem is a complex issue that requires significant efforts and changes in human behavior.

In Terms of Long-Term Temperature Increases in the Atmosphere, Which