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Atmospheric CO₂ (Mauna Loa) vs US Median Age
Atmospheric CO₂ (Mauna Loa) and US Median Age correlate at r = +0.97 over 65 years (1959–2023), p < 0.0001. With the time trend removed, r = +0.22. Likely spurious (shared time trend).
Verdict: Likely spurious (shared time trend). Both series mostly just trend over time. After removing that trend the correlation collapses to 0.22 — the relationship is probably coincidental, not causal.
- Pearson r
- +0.97
- p-value
- < 0.0001
- Years compared (n)
- 65 (1959–2023)
- 95% confidence interval
- 0.96 to 0.98
- Correlation with the time trend removed
- +0.22
Sources
- Atmospheric CO₂ (Mauna Loa) (ppm): NOAA GML. Annual mean atmospheric carbon dioxide measured at Mauna Loa Observatory, Hawaii (NOAA GML).
- US Median Age (years): Our World in Data. US Median Age (Our World in Data: Median age).
Related pairs
- Atmospheric CO₂ (Mauna Loa) vs US GDP per Capita (r = +0.99)
- Atmospheric CO₂ (Mauna Loa) vs US Population (r = +0.99)
- US Median Age vs US Adult Obesity (r = +0.99)
- Atmospheric CO₂ (Mauna Loa) vs US GDP (current US$) (r = +0.98)
- US Median Age vs US Population (r = +0.98)
- Atmospheric CO₂ (Mauna Loa) vs US Cereal Yield (r = +0.98)
Correlation does not imply causation. How the verdict is worked out.