How did monthly CO₂ at Mauna Loa change from 2016 to 2018 (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 (Apr 2017), the actual values were:
| Date | Actual value |
|---|---|
| May 2017 | 409.89 |
| Jun 2017 | 409.08 |
| Jul 2017 | 407.33 |
| Aug 2017 | 405.32 |
| Sep 2017 | 403.57 |
| Oct 2017 | 403.82 |
| Nov 2017 | 405.31 |
| Dec 2017 | 407 |
| Jan 2018 | 408.15 |
| Feb 2018 | 408.52 |
| Mar 2018 | 409.59 |
| Apr 2018 | 410.45 |
| May 2018 | 411.44 |
| Jun 2018 | 410.99 |
| Jul 2018 | 408.9 |
| Aug 2018 | 407.16 |
| Sep 2018 | 405.71 |
| Oct 2018 | 406.19 |
| Nov 2018 | 408.21 |
| Dec 2018 | 409.27 |
About this dataset
- Category: Climate
- Source: NOAA Global Monitoring Laboratory
- Date range: Jan 2016 – Dec 2018
- Data points: 36
- Source fetched: Nov 10, 2026
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