In a previous post, we examined the Central England Temperature (CET) dataset, which is the oldest instrumental temperature data record, and found that temperatures had not significantly warmed over the last 15 years. In this post, we'll examine whether increasing atmospheric CO2 levels have caused "unprecedented" temperature changes, as claimed by global warming alarmists and your typical leftist/liberal/progressive Democrat politician, bureaucrat and, of course, taxpayer funded (enriched) climate scientist. (click on images to enlarge)
The above chart plots single year changes in CET temperatures and atmospheric CO2 levels. The data clearly shows that temperatures have always been highly variable, and both recent temperature changes up and down are not "unprecedented." The lack of unprecedented modern temperature change is additionally exposed by the blue curve, a 10-year average of annual temperature changes. And, it's visually obvious that past annual temperature changes were more extreme prior to the modern increase in atmospheric CO2 levels.
The second chart depicts a rolling 15-year temperature change. Again, the graphed data reveals modern 15-year period temperature changes not to be "unprecedented" and CO2 levels to be basically irrelevant. Indeed, temperature changes just seem happen over 15-year spans, naturally.
What about rolling 30-year "unprecedented" modern temperature changes? The above third chart finds it's the 'same old, same old' - past temperature changes have been more significant than modern temp changes and CO2 levels are not a major factor.
Finally, this last chart plots 60-year temperature changes. Certainly, after 60 years of increasing human CO2 emissions, the temperature record has to show "unprecedented" warming swings that provide a clear signal that modern climate change is highly unusual. Unfortunately for all alarmists and liberal/leftists, the real data reveals the bogosity of their claims - they've been flat out wrong per the world's best-of-breed and oldest instrumental temperature record.
Top Ten 1-Yr. temperature increase changes (year ending): 1741, 1846, 1893, 1880, 1666, 1743, 1831, 1868, 1800, 1997
Top Ten 15-Yr. temperature increase changes (year ending): 1831, 1710, 1868, 1894, 1755, 1779, 1707, 1706, 1828, 1781
Top Ten 30-Yr. temperature increase changes (year ending): 1868, 1846, 1949, 1921, 1727, 1728, 1781, 1770, 1722, 1724
Top Ten 60-Yr. temperature increase changes (year ending): 1741, 1846, 1893, 1880, 1743, 1831, 1868, 1800, 1997, 1815
Note: Each "Top Ten" are listed from largest to smallest temperature increase.
Additional modern temperature charts.