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Atmospheric Methane (global) vs US Marriage Rate

Atmospheric Methane (global) and US Marriage Rate correlate at r = -0.95 over 38 years (1984–2022), p < 0.0001. With the time trend removed, r = +0.06. 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 0.06 — the relationship is probably coincidental, not causal.

Pearson r
-0.95
p-value
< 0.0001
Years compared (n)
38 (1984–2022)
95% confidence interval
-0.97 to -0.90
Correlation with the time trend removed
+0.06

Sources

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Correlation does not imply causation. How the verdict is worked out.