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.
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.