# Keeling curve

Monthly mean CO₂ in the air at Mauna Loa, Hawaii, from March 1958, as NOAA's
Global Monitoring Laboratory publishes it, with the notebook that reads and
plots it.

| File                  | What it holds                                                                                                            |
| --------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| `data/co2_mm_mlo.csv` | NOAA's file of 9 October 2026, unchanged: year, month, decimal date, monthly mean, deseasonalized, days, sd, uncertainty |

- **Source:** https://gml.noaa.gov/ccgg/trends/ (NOAA GML); before May 1974,
  Scripps Institution of Oceanography, https://scrippsco2.ucsd.edu/.
- **Terms:** NOAA makes the data freely available and asks to be cited:
  Lan, X., Tans, P. and Thoning, K. W., Trends in globally-averaged CO₂
  determined from NOAA Global Monitoring Laboratory measurements.
- **Read it:** `sh.load("sciencehub-team/keeling-curve").load_co2()`, or
  `pd.read_csv("sciencehub://sciencehub-team/keeling-curve/data/co2_mm_mlo.csv", comment="#")`.