A scientist who studies the long term effects of an increase of C02 in the atmosphere is most likely a (n):

A. oceanographer.

B. geologist.

C. meteorologist.

D climatologist.

D. climatologist

Explanation:

The climatologists are scientists that have their focus on the long term effects fro different factors on the atmosphere, thus the influence they have on the climate. Studying the CO2 increase in the atmosphere falls into this category, as the CO2 is one of the most important gasses that influence the global climate. The importance of the CO2 is mostly seen in the fact that it is the most abundant greenhouse gas, managing to trap the reflected heat, thus contributing to rise in the global temperatures and causing big changes in the climate.