The proponents of manmade global warming routinely offer charts like Michael Mann’s “hockey stick” published by the UN claiming that atmospheric temperatures were basically stable over the past millennium until they soared after the Industrial Revolution and the advent of the automobile when human CO2 emissions soared exponentially.
In reality, atmospheric temperatures over the past millennium did not plod along like the lines on the Mann graph and instead swung wildly up and down as the graph of the actual raw data shows below.
The noisy spread of temperatures between the swings on this graph is represents the natural variation of atmospheric temperature driven by the constantly changing interaction of the sun’s energy with the oceans and atmosphere.
This week, Duke University published a peer reviewed study of the actual raw temperature data over time and found that the slight warming over the past century and the “moderate” manmade global warming model predictions are well within the natural variability of temperature over the past millennium. In sum, Duke found that human CO2 emissions do not appear to be producing a pronounced warming outside of the natural variation of the climate.
How then can we account for the difference between the raw temperature data used by Duke University and the nice smooth temperature line shown in the Mann “hockey stick” graph?
It is becoming increasingly clear that the proponents of manmade global warming who run the major temperature databases are statistically manipulating the real temperature data to show a significant recent warming that does not exist in fact.
The first evidence of this manipulation emerged back during the 2009 Climategate scandal, when a still unknown person disclosed reams of secret data from Britain’s Climate Research Unit at East Anglia (CRU). Internal programing notes in the CRU database suggested that scientists at CRU had simply made up many of the weather stations and measurements upon which their “adjusted” temperature record relied.
In 2011, the BEST database published “adjusted” temperature data showing uninterrupted warming since 1950, when the raw data showed no warming for the past decade.
In 2015, NASA’s Goddard Institute for Space Studies (GISS) claimed that 2014 was the hottest year in recorded history, but closer examination of their data revealed that GISS scientists were manipulating South American temperature measurements upward.
Hopefully, we will soon have a more thorough review of the discrepancies between the “adjusted” temperature data published by the major databases and the raw temperatures measured at the actual weather stations. The Global Warming Policy Foundation, a think tank dedicated to challenging the manmade global warming hypothesis, has engaged five scientists from various scientific fields to look into that question.
Manmade global warming advocates have already started to attack the proposed study before it has even completed its work. Pay no attention to that data behind the curtain, they exclaim!