How did monthly atmospheric methane worldwide change from 2019 to 2021 (ppb)?
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 2020), the actual values were:
| Date | Actual value |
|---|---|
| Apr 2020 | 1,875.81 |
| May 2020 | 1,874.46 |
| Jun 2020 | 1,872.04 |
| Jul 2020 | 1,871.51 |
| Aug 2020 | 1,876.44 |
| Sep 2020 | 1,884.64 |
| Oct 2020 | 1,890.04 |
| Nov 2020 | 1,891.51 |
| Dec 2020 | 1,891.04 |
| Jan 2021 | 1,888.67 |
| Feb 2021 | 1,886.7 |
| Mar 2021 | 1,888.05 |
| Apr 2021 | 1,890.85 |
| May 2021 | 1,891.34 |
| Jun 2021 | 1,888.16 |
| Jul 2021 | 1,886.04 |
| Aug 2021 | 1,892.38 |
| Sep 2021 | 1,902.51 |
| Oct 2021 | 1,907.97 |
| Nov 2021 | 1,909.27 |
| Dec 2021 | 1,908.03 |
About this dataset
- Category: Climate
- Source: NOAA Global Monitoring Laboratory
- Date range: Jan 2019 – Dec 2021
- Data points: 36
- Source fetched: Nov 10, 2026
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