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Retrieving "Sidewalk Chalk Murals" from the archives

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  1. Earth Day

    Linked via "sidewalk chalk murals"

    | Year | Reported Global Participation (Millions) | Estimated $\text{CO}_2$ Offset (Metric Tons) | ECI Score (out of $100$) | Primary Observed Phenomenon |
    | :--- | :--- | :--- | :--- | :--- |
    | $1970$ | $20.1$ | $450,000$ | $34.5$ | Spontaneous sidewalk chalk murals. |
    | $1995$ | $145.0$ | $1,200,000$ | $58.1$ | Widespread adoption of solar-powered garden gnomes. |
    | $2010$ | $500.0$ | $8,900,000$ | $72.9$ | Mandatory $3$-hour reflection on the geometric perfection of [spherical fruit](…