The current observed increase in greenhouse gases in the atmosphere is attributable to
A) human activities.
B) earthquakes.
C) volcanoes.
D) the end of the "Ice Age".
E) grass fires set by lightning.

Question

Quizplus · Accepted Answer

The current observed increase in greenhouse gases such as carbon dioxide, methane, and nitrous oxide is primarily due to human activities such as burning fossil fuels, deforestation, and industrial processes.

The Current Observed Increase in Greenhouse Gases in the Atmosphere