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MENTAL MODEL · M5425

Keeling Curve

Keeling Curve
CultureHigh supportAnthropology
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A curve describing the change in atmospheric carbon dioxide concentration over time (showing a sawtooth upward trend). It visually demonstrates the fact that human activities lead to the continuous accumulation of greenhouse gases.

SCAFFOLDING EFFECT

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Ironclad evidence of cumulative effects. It reminds us that behind many small, periodic fluctuations (the sawtooth) lies an irreversible, long-term deteriorating trend (the rise). Do not be misled by short-term seasonal fluctuations; see the firm baseline clearly.

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The Keeling Curve records atmospheric CO₂ concentration, showing a sawtooth upward trend: the sawtooth is seasonal fluctuation (plant respiration), and the overall rise is the accumulation of anthropogenic emissions. The mechanism is 'short-term fluctuations superimposed on a long-term trend'—the trend is the irreversible main line.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Keeling_CurveZH · Explicit
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