As US coal production has declined, babies named Luna have multiplied, a negative correlation of -0.979 that connects the death of fossil fuels to the rise of celestial baby naming with the environmental poetry of a chart observing one form of darkness receding while another form of moonlight emerges. The coal mine closes, the Luna is born, and the chart traces the cultural evolution of a nation moving from extraction to aspiration.
Coal production declined from about 1.1 billion tons to under 540 million. Luna grew to over 7,500 babies per year. One declines (energy transition), the other rises (naming fashion). Both are eighteen-year trends driven by different aspects of the same modernization: coal declines because renewables are cheaper, Luna rises because cosmopolitan names are fashionable. The shared variable is a nation changing its energy source and its naming conventions in the same direction: away from the industrial and toward the natural.
Eighteen years of less coal and more Lunas is a correlation that reads like a metaphor for generational change: the fuel that powered the industrial era declines while the name that evokes the natural world rises. The mine shaft darkens, the moonlight brightens, and the chart records the transition with the poetic precision of a coefficient that has accidentally written an environmental allegory.
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Want to learn more about why correlations like “US coal production” vs “Babies named Luna (US)” don't prove causation? Read our guide to statistical thinking.
