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David Ho

The most iconic figure in the environmental sciences is the Keeling Curve, the CO₂ record from Mauna Loa, Hawaii.

NOAA had a wonderful site where you could visualize and download these data, and now it's just gone. These data belong to us and we should not let this happen!

A line graph showing atmospheric CO2 levels at Mauna Loa Observatory from 1955 to 2025. The y-axis represents CO2 mole fraction in parts per million (ppm), ranging from 320 to 420 ppm, while the x-axis is years.
Feb 05, 2025, 12:09 PM·Public
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