Question: Which of the following correctly depicts the long-term record of atmospheric CO2 concentration? Need Assignment Help?
Group of answer choices
The concentration of this gas has gone up and down for millennia, and the current trend is similar to past rises.
Cows passing gas are the dominant contributor to global CO2 levels. The concentration of this gas as constant until 1960, at which time it started to increase.
The concentration of this gas has fluctuated over 100's of thousands of years, but has recently shot up way higher than in the past.
The concentration of this gas does not vary with the seasons.