Did CO2 emissions increase or decrease this year?

Grade level: 4 – 6th grades

Math Skills: Percentage

Related environmental issues: Climate Change

Carbon dioxide (CO2) emissions dropped by 7% in the world this year. This is the biggest annual fall in CO2 since World War II.

CO2 emissions in 2019 were 4.5 tons per person. How much of CO2 was emitted per person in 2020?



4.5 – 0.315 = 4.185 ≈ 4.2 (tons)


4.5×0.93=4.185 ≈ 4.2 (tons)

Source) BBC News, Dec 10, 2020. “Climate change: Covid drives record emissions drop in 2020.  

bp, Statistical Review of World Energy, 2020. Carbon emissions in 2019


Factful Environmental Math Problems (2020)

Just published and now available from Amazon  (paperback)

About this book

The objective of Factful Environmental Math Problems is to cultivate our young people’s skills to analyze and evaluate fact-based data for understanding our world, while improving their math skills and critical thinking skills.

With the rise of the Internet and new technology, building skills to analyze and evaluate fact-based data becomes increasingly important for our young people to prepare for this rapidly changing world. These skills minimize their chances of being brainwashed by false information and making uninformed decisions and ultimately help develop their critical thinking skills. (Read more)

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Published: March 26, 2020

Price: $6.25