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Atmospheric CO₂ (Mauna Loa) vs US Forest Area
Atmospheric CO₂ (Mauna Loa) and US Forest Area correlate at r = +0.95 over 34 years (1990–2023), 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
- +0.95
- p-value
- < 0.0001
- Years compared (n)
- 34 (1990–2023)
- 95% confidence interval
- 0.91 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 Forest Area (% of land): World Bank. US Forest Area (World Bank indicator AG.LND.FRST.ZS).
Related pairs
- Atmospheric CO₂ (Mauna Loa) vs US GDP per Capita (r = +0.99)
- Atmospheric CO₂ (Mauna Loa) vs US Population (r = +0.99)
- Atmospheric CO₂ (Mauna Loa) vs US GDP (current US$) (r = +0.98)
- Atmospheric CO₂ (Mauna Loa) vs US Cereal Yield (r = +0.98)
- Atmospheric CO₂ (Mauna Loa) vs Atmospheric Methane (global) (r = +0.98)
- US Forest Area vs US Mobile Subscriptions (r = +0.98)
Correlation does not imply causation. How the verdict is worked out.