Natural Science CLEP Prep Practice Exam

An increase in the amount of carbon dioxide in the atmosphere leads to an increase in global temperatures due to the greenhouse effect. Carbon dioxide is a greenhouse gas that traps heat in the Earth's atmosphere, preventing it from escaping into space. As the levels of carbon dioxide increase, more heat is trapped, leading to higher temperatures globally. Therefore, options A and C are incorrect as they suggest a decrease or no effect on global temperatures. Option D is incorrect as it implies that the increase in carbon dioxide has varying effects in different areas, when in reality it leads to an overall increase in global temperatures. Option B is the only correct answer as it accurately explains the relationship between carbon dioxide levels and global temperatures.