How did monthly CO₂ at Mauna Loa change from 2004 to 2006 (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 2005), the actual values were:
| Date | Actual value |
|---|---|
| Apr 2005 | 382.48 |
| May 2005 | 382.64 |
| Jun 2005 | 382.4 |
| Jul 2005 | 380.93 |
| Aug 2005 | 378.93 |
| Sep 2005 | 376.89 |
| Oct 2005 | 377.19 |
| Nov 2005 | 378.54 |
| Dec 2005 | 380.31 |
| Jan 2006 | 381.58 |
| Feb 2006 | 382.4 |
| Mar 2006 | 382.86 |
| Apr 2006 | 384.8 |
| May 2006 | 385.22 |
| Jun 2006 | 384.24 |
| Jul 2006 | 382.65 |
| Aug 2006 | 380.6 |
| Sep 2006 | 379.04 |
| Oct 2006 | 379.33 |
| Nov 2006 | 380.35 |
| Dec 2006 | 382.02 |
About this dataset
- Category: Climate
- Source: NOAA Global Monitoring Laboratory
- Date range: Jan 2004 – Dec 2006
- Data points: 36
- Source fetched: Nov 10, 2026
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