[Excellence]

I just noticed something abut this chart you sent me. The blue label says “Temperature change from 1950 to 1980.” But each line on the chart represents 10,000 years. The time range is over a 160,000 year period, how does one measure 30 years, and who cares what happens in a microscopic 30 year period?! And it looks as if it was even hotter a mere 10,000 year ago. Does this fall under the general heading of obfuscation?

[E. Pluribus Unum]

The blue label says “Temperature change from 1950 to 1980.” But each line on the chart represents 10,000 years.

It actually says "Temperature Change 1950-1980 Mean."

They are using the mean (average) temperature during that period as the reference temperature. In other words, the period 1950-1980 is "0.0" on the Y-axis. The temperatures for all other years are degrees above or degrees below the average temperature for the 1950-1980 period.

There is no obfuscation going on here. They are perfectly reasonable scaling factors.