In the past 100 years the increase in the average temperature is 2 degree. This is because of the global warming that there is a increase in the overall temperature.
The release of more and more carbon dioxide in the environment has lead to increase in the absorption of solar radiation.
The carbon dioxide has the ability to absorb heat from the atmosphere. More carbon dioxide will trap more heat from the atmosphere and thus increasing the global temperature.
Since the question states that they want to determine the population of the desert mice. You get the direct answer from just using context clues. Since population means one species in a certain area, it means that this method will work if the mice stay in the same area.
