Has modern human CO2 emissions caused unprecedented, irreversible and accelerating global warming? Convincingly not, per an analysis of UK's gold-standard climate research dataset...certainly, a very inconvenient climate 'FactCheck'.....
Regarding claims of "irreversible" and "accelerating" global warming, the scientific empirical evidence (analysis of monthly measurements) comparisons is indisputable: over the last 15+ years, global warming has gone AWOL, which the climate "experts" are mystified about.
Ergo, modern global warming has been in a non-accelerating state, a status reversal taking place since the late 1990's.
Here and here, the scientific evidence from NOAA, when analyzed from a 5-year climate change viewpoint, clearly shows that both modern U.S. and world-wide warming are not "unprecedented" when compared to earlier 20th century periods.
Moving on to a different perspective, the adjacent chart documents that modern atmospheric CO2 levels growth was approximately 6 times greater than during that of the pre-1950 period.
Yet, this immense growth of modern emissions barely produced an uptick in 10-year global warming averages, when compared to a similar time span for the pre-1950s. This is the undeniable result of an analysis of the UK's HadCRUT4 global climate record dataset.
The difference between the two period's 10-year average increase was a trivial +0.1°C - that's well within the range of what natural climate variation could explain. If HadCRUT3 datapoints were used instead, the difference shrinks to +0.05°C.
These differences are meaningless; of no material, meaningful climate consequence; and, totally undeserving of the label "unprecedented."
Climate Change FactCheck Summation: Analyzing 1,853 datapoints of moving 10-year average global temperatures establishes there is no significant empirical evidence from the gold-standard HadCRUT4 climate records that would even suggest that modern-era warming deserves the "unprecedented" designation. Simply stated, scientists and politicians utilizing that adjective are intentionally being deceptive in order to solely advance a political agenda. Likewise, the deceptive use of the descriptors "accelerating" and "irreversible" are also not supported by any scientific evidence.
Additional information regarding the chart:
- From a 10-year average global temperature low, established during November 1976, the modern warming period spanned 410 months, ending during December 2010 when the 10-year average peak occurred.
- The pre-1950 (prior to the huge 'modern' consumer/industrial CO2 emissions) 10-year average temperature peaked during May 1945. Creating a similar 410-month span, establishes April 1912 as pre-1950 low point for this apple-to-apple comparison.
- The atmospheric CO2 level (ppm) growth amounts depicted by the chart are based on these two 410-month periods.
Note: NOAA global temperature dataset and Excel used to produce above infographic and 10-year averages; or download original data from this site. Hey, don't know how to chart in Excel? It's easy to produce charts - you can do it too! Go here to learn how.