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Atmospheric CO₂ (Mauna Loa) vs US Cereal Yield
Atmospheric CO₂ (Mauna Loa) and US Cereal Yield correlate at r = +0.98 over 64 years (1961–2024), p < 0.0001. With the time trend removed, r = +0.50. Interpret with caution.
Verdict: Interpret with caution. Much of the apparent link is driven by a shared time trend: r falls from 0.98 to 0.50 once the trend is removed.
- Pearson r
- +0.98
- p-value
- < 0.0001
- Years compared (n)
- 64 (1961–2024)
- 95% confidence interval
- 0.96 to 0.99
- Correlation with the time trend removed
- +0.50
Sources
- Atmospheric CO₂ (Mauna Loa) (ppm): NOAA GML. Annual mean atmospheric carbon dioxide measured at Mauna Loa Observatory, Hawaii (NOAA GML).
- US Cereal Yield (kg per hectare): World Bank. US Cereal Yield (World Bank indicator AG.YLD.CREL.KG).
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 Atmospheric Methane (global) (r = +0.98)
- Atmospheric CO₂ (Mauna Loa) vs US Adult Obesity (r = +0.98)
- US Cereal Yield vs US Population (r = +0.97)
Correlation does not imply causation. How the verdict is worked out.