The 650,000-year record for carbon dioxide (CO2)

Climate reconstructions indicate that carbon dioxide (CO₂) levels

Question

The 650,000-year record for carbon dioxide (CO2) Climate reconstructions indicate that carbon dioxide (CO₂)levels

Quizplus · Accepted Answer

The question asks for the record of carbon dioxide levels over the past 650,000 years. The correct answer is A, as reconstructions indicate that CO2 levels are currently at the highest they have been during this time period. B, C, and D are all incorrect as they all suggest a consistent or fluctuating decrease in CO2 levels, which is not supported by the evidence. E is partially true in that there have been some minor fluctuations, but it is not the best choice because it does not accurately reflect the current high levels of CO2.

The 650,000-Year Record for Carbon Dioxide (CO2)