File name: StateoftheClimate2015_carbondioxide_graph_1860.png Original Resolution: 1860 × 1116 File Size: 514 KB (MIME Type: image/png) Date Published: July 27, 2021 Download file View image caption Monthly average carbon dioxide amounts (blue line) measured at Mauna Loa observatory. The bright pink line shows carbon dioxide concentrations with the seasonal cycle smoothed out. Full story.