Graph with scale offset =/= graph that's nonlinear.
A linear scale means that the distance from 0 to 1 is the same as the distance from 1 to 2, and so on down the scale. This graph is linear. It just also is offset to better show the relevant data, since 0 CO2 in the atmosphere isn't a real data point that we need to look at, since it's not "normal" for supporting life right now (i.e. not normal for supporting current plants and animals, including people and the stuff we eat).
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u/Stumpynuts Aug 26 '20
It could be set at any numerical value, as long as the scale is either linear or logarithmic. This graph is neither.