Per NOAA: Late 20th Century Global Warming Not "Unprecedented" - Previous Warming Greater
Recently, the climate change myth that global warming is "accelerating" has been shattered by the near-zilch warming for the last 17 years - indeed, to the point where even climate change alarmist scientists are being forced to admit that 'the pause' remains unexplained.
Another climate myth that can no longer weather the empirical storm is that human CO2 emissions have created an "unprecedented" global warming change regime. Of course, this myth completely melts when contrasted to previous climate warmings during ancient and historical periods.
Yet, it is still a widely accepted myth for periods since 1980 - that human CO2 has caused unprecedented temperature increases, far outpacing any previous 20th century warming increases. That is not true, though, per the NOAA empirical evidence of the climate record.
The above chart depicts the last 100 years of global warming increases, segmented by two 50-year periods, which handily exposes the lameness of the myth.
The column on the left shows the cumulative NOAA temperature change over 50 years, starting in 1914, including the atmospheric change in CO2 levels (black vertical bar) over that same 50 years. The column on the right represents the same information, but instead for the 50-year period starting in 1964.
One does not have to be a climate "rocket" scientist to recognize that the earlier 20th century warming increase was greater than the modern warming. And it is painfully clear, even to proponents of this myth, that the earlier warming increase took place while the CO2 level change was a fraction of that during the modern 50-year period ending in 2013.
From this actual NOAA/NCDC climate record, one can fairly surmise the following: First, modern global warming change is not accelerating, nor unprecedented. Second, that natural climate change is most likely responsible (seeNature science journal article) for the majority of warming increases experienced during the two 50-year periods, not human CO2 emissions.