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

Multiple Choice

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.