Final answer:
Yes, there is a negative correlation between atmospheric carbon dioxide levels and the number of pirates, but this does not mean there is a cause-and-effect relationship. The dramatic rise in atmospheric carbon dioxide is primarily due to the burning of fossil fuels, not the decrease in piracy.
Step-by-step explanation:
You asked whether there is a negative correlation between the levels of atmospheric carbon dioxide and the number of pirates worldwide. The correct answer is a. Yes, there is a statistically negative correlation between these two variables, meaning as one increases, the other tends to decrease. However, it's important to clarify that correlation does not imply causation; the decrease in pirates is not causing the increase in carbon dioxide levels.
Over the past few decades, atmospheric carbon dioxide levels have dramatically increased due to human activities, particularly the burning of fossil fuels. This introduces large amounts of this greenhouse gas into the atmosphere at an unprecedented rate, which is linked to climate change and is expected to impact biodiversity greatly. Historical data show that atmospheric carbon dioxide naturally cycled between 180 and 300 ppm, but recent industrial activity has pushed these levels beyond the historical maximum, now reaching levels never seen in human history.
While the correlation between pirates and carbon dioxide levels is a humorous way to illustrate a statistical principle, the serious issue at hand is the rapid and unprecedented increase in atmospheric carbon dioxide and its potential effects on global climate and the future of biodiversity.