Global average air temperatures worldwide
A) have appeared to stabilize after a century of increase.
B) are at present demonstrating no apparent trend one way or another.
C) are being influenced by human-induced changes in the greenhouse effect.
D) are generally lower than 20 years ago.

Question

Quizplus · Accepted Answer

The question refers to the global average air temperatures, which have been demonstrated to be influenced by human-induced changes in the greenhouse effect through the emission of greenhouse gases. The stabilization of temperatures mentioned in option A is incorrect, and there is evidence of an overall increase in temperatures over the past century. Option B is also incorrect, as temperature records show an overall warming trend. Option D is incorrect, as global temperatures have been increasing overall and are generally higher than 20 years ago.

Global Average Air Temperatures Worldwide