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Atmospheric Carbon Dioxide (CO2) and Methane (CH4) levels, 1800–present
Warning: javascript is disabled, so interactive features are unavailable (and the graph is out of date).
To see precise values, hover your mouse cursor over the red and blue graph traces.
(However, all values are shown with about one more significant digit than is warranted by the precision
of the measurements, and the ice core values are less accurate than the Mauna Loa measurements.)
Click here for a downloadable, bookmarkable image
(or in Internet Explorer you can use
PrtScn).
The relative scaling of the CO2 and CH4 axes was chosen so that the relative visual magnitude
of changes in the two traces would very roughly approximate the relative warming effect of changes in the levels of
the two gases. Additional CH4 is
variouslyestimated
to have between 20x
and 80x the warming effect of the
same amount of additional CO2; we used 25:1 so that the grid lines would line up nicely in the graph
(and it is also very close to the 26.5:1 figure
from the first two rows of AR6 Table 8.A.1, p.731
[alt]),
but 40:1 or 45:1 would have been more accurate.
However, the absolute height of the CH4 trace in this graph, relative to the bottom of the graph,
still greatly exaggerates its total warming affect, compared to CO2. ↑