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US CO₂ Emissions per Capita vs US R&D Expenditure

US CO₂ Emissions per Capita and US R&D Expenditure correlate at r = -0.88 over 28 years (1996–2023), p < 0.0001. With the time trend removed, r = -0.32. Interpret with caution.

Verdict: Interpret with caution. Much of the apparent link is driven by a shared time trend: r falls from -0.88 to -0.32 once the trend is removed.

Pearson r
-0.88
p-value
< 0.0001
Years compared (n)
28 (1996–2023)
95% confidence interval
-0.94 to -0.75
Correlation with the time trend removed
-0.32

Sources

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