How did monthly CO₂ at Mauna Loa change from 1985 to 1987 (ppm)?
This is a real historical chart. Extraplot shows you the beginning and asks you to draw what happens next, then reveals the actual line. Below is the full series with the reveal point marked.
Solid line = visible part you would draw from · dashed violet = the actual revealed data after the cutoff.
The reveal
After the cutoff (Mar 1986), the actual values were:
| Date | Actual value |
|---|---|
| Apr 1986 | 349.86 |
| May 1986 | 350.52 |
| Jun 1986 | 349.98 |
| Jul 1986 | 348.25 |
| Aug 1986 | 346.17 |
| Sep 1986 | 345.48 |
| Oct 1986 | 344.82 |
| Nov 1986 | 346.22 |
| Dec 1986 | 347.48 |
| Jan 1987 | 348.73 |
| Feb 1987 | 348.92 |
| Mar 1987 | 349.81 |
| Apr 1987 | 351.4 |
| May 1987 | 352.15 |
| Jun 1987 | 351.58 |
| Jul 1987 | 350.21 |
| Aug 1987 | 348.2 |
| Sep 1987 | 346.66 |
| Oct 1987 | 346.72 |
| Nov 1987 | 348.08 |
| Dec 1987 | 349.28 |
About this dataset
- Category: Climate
- Source: NOAA Global Monitoring Laboratory
- Date range: Jan 1985 – Dec 1987
- Data points: 36
- Source fetched: Nov 10, 2026
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