Which of the following best summarizes how atmospheric concentrations of carbon dioxide change throughout the course of a year?
A)They tend to remain stable.
B)They tend to go up and down.
C)They tend to keep decreasing.
D)They tend to keep increasing.

Question

Quizplus · Accepted Answer

Atmospheric concentrations of carbon dioxide tend to fluctuate throughout the course of a year due to seasonal changes in plant growth and decay, as well as changes in the amount of carbon dioxide taken up and released by the ocean. However, over longer timescales, concentrations have been steadily increasing due to human activities such as burning fossil fuels.

Which of the Following Best Summarizes How Atmospheric Concentrations of Carbon