Question

Atmospheric Carbon Dioxide Levels and Population Growth (1920-2020)
Column 1
Column 2
Column 3
Year
Atmospheric Carbon Dioxide Concentration
(ppm)
Global Population (Billions)
1920
303
1.86
1940
310
2.30
1960
316
3.03
1980
339
4.43
2000
369
6.12
2020
412
7.79
Data Source: The data points for atmospheric carbon dioxide levels were estimated based on historical records available in public domain datasets like those from NOAA and the Mauna Loa Observatory. Population data was derived from historical estimates by world population databases such as the United Nations.
For this question, please answer the following:

1. Describe the overall pattern/trend you see in columns 2 and 3. Include in your description:

a) what is being measured in each column and

b) state two specific data points from Columns 2 and/or Column 3.

2. Next, describe the relationship of the data in column 2 and column 3 (in other words, how is the pattern in column 2 related to the pattern in column 3?).
3. Explain why the data in column 2 and column 3 are related in the way you described in part 2. You are making a hypothesis/educated guess here!
4. State the actions that could be taken to slow or reverse the pattern/trend in column 2.



Grading Considerations:

All 4 parts should be answered. Be sure to include parts a and b in part 1.
Create a list numbered 1-4 in your answer to ensure you answer all parts!
Answers should be in complete sentences.
Answers longer than 8 sentences will not be considered. Answering concisely and to the point is evidence for your understanding of the topic.

Answer 1

1. Column 2 measures atmospheric carbon dioxide concentration in parts per million (ppm) and Column 3 measures global population in billions; both show steady increases from 1920 to 2020—for example, CO2 rises from 303 ppm in 1920 to 412 ppm in 2020, and population rises from 1.86 billion in 1920 to 7.79 billion in 2020.
2. The two columns show a positive relationship over time: as global population grows, atmospheric CO2 levels also rise, indicating they move together.
3. A plausible explanation is that a larger population increases energy use, fossil fuel burning, industrial production, and land-use changes (like deforestation), all of which emit CO2 and drive higher atmospheric concentrations.
4. To slow or reverse rising CO2, society can rapidly cut fossil fuel use by shifting to renewables and efficiency, protect and restore forests and soils, electrify transport and industry, and deploy emissions reductions and carbon removal policies.