Which of the following statements about carbon dioxide is most accurate?

Question

BlackTom AI · Accepted Answer

Question recap: We’re asked which statement about carbon dioxide is most accurate, with three options to evaluate.
Option A: 'agriculture and land-use changes account for the highest share of carbon dioxide emissions' This is not accurate because while agriculture and land-use changes (including deforestation) contribute to CO2 emissions, the largest share of CO2 emissions comes from burning fossil fuels (coal, oil, natural gas) for energy and transport. Therefore, this option incorrectly assigns the top share to a sector that does not dominate CO2 emissions.
Option B: 'carbon dioxide levels are the highest they have been in over 800,000 years' This aligns with well-supported paleoclimate data. Ice core records show atmospheric CO2 concentrations have risen sharply since the Industrial Revolution and currently exceed any level in at least the past 800,000 years, making this statement accurate.
Option C: 'about 10% of carbon dioxide emissions from the 17th century onward occurred in the last 30 years' This is misleading. It misrepresents the growth of emissions: the recent decades did see a rapid increase, but framing it as a fixed 10% of a long tail of emissions since the 1600s is not an established or precise characterization of CO2 emissions history. It also ignores the cumulative rise and the continuous, heavy contributions from fossil fuel combustion across centuries.
So, analyzing each choice, A misattributes the largest share to agriculture/land-use, B correctly reflects current scientific understanding of atmospheric CO2 levels in the context of the last hundreds of thousands of years, and C provides an incorrect, oversimplified percentage when describing a long historical emission record. The most accurate statement among the three is the one concerning CO2 levels being higher now than in the last several hundred thousand years.

FINA3401.13791.202610 Midterm CFA Quiz- Requires Respondus LockDown Browser

Which of the following statements about carbon dioxide is most accurate?

View Explanation

Log in for full answers

Similar Questions

According to the IPCC Working Group 3 report, the stated emissions reductions from signatory countries are not enough to limit warming to 1.5ºC.

According to the global greenhouse gas emission pathways shown, what is the expected temperature increase by 2100 if current policies are followed without additional action?

Do you believe individual actions can make a significant difference in combating climate change? (yes or no)

Exxonmobile initially denied climate science showing fossil fuels caused greenhouse gas emissions that are responsible for a warming planet. But in recent years it has reversed its position and now spends millions on educating the general public about the issue.

According to the article "Climate Scientists: ‘Net Zero’ is a dangerous trap," the threats of climate change are the direct result of there being too much carbon dioxide in the atmosphere. Solutions that don't actually change the amount of carbon dioxide in the air are not real solutions.

Results of recent climate models suggest that projected greenhouse gas emission patterns may lead to a global warming of 1.4 to 5.8 degrees Celsius during _____.

The amount of carbon dioxide (CO2) released by factories and automobiles has soared, while the quantity of plant life on Earth has diminished. The net result is a rising concentration of CO2 in the atmosphere, which in turn has led to __________.

Climate change mitigation to a level of 1.5 degrees Celsius can be achieved by radically cutting greenhouse gas emissions.

More Practical Tools for International Students

Homework AI Solver

Stylized Writing Assistant

Plagiarism Checker Assistant

Citation Assistant

In-Class Translation Assistant

Class Notes Assistant

Quiz Search Assistant

Past Exam Questions by School

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler