The plot you're citing is an imaginary projection 100 years into the future given what was known up to the year on the x-axis. That is why the units are 100x la

The plot you're citing is an imaginary projection 100 years into the future given what was known up to the year on the x-axis. That is why the units are 100x larger. The uncertainty on the rate of change is quite large (relatively), therefore, any 100 year projection has huge, compounded uncertainty. Figure 2 is not useful for determining anything about the present.