OK here is the deal Looking back 4 or 5 thousand years there appears to be a cycle of ups and downs ranging around 1,000 to 1,100 years with a swing in temperatures of around 1.3 to 1.4 degrees C. Then there is a shorter cycle of 60 to 70 years with a swing of temperature of .3 to .4 degrees C. Lastly there is warming from CO2 which when modeled properly using a logistics curve (sensitivity value of around .7 to .9 C per doubling of CO2) will give an increase in temperature of between 1.1 and 1.2 degrees C but it peaks at between 800 and 1,000 pppm at that value and at 400 ppm we have already realized about a 1/3 of that amount so CO2 can only add .75 additional degrees C even at CO2 levels well over 1000 ppm.
When these three items are properly alined, based on historic data going back 2,000 years, a model that matches NASA-GISS month values using a running 12 month average very closely can be constructed and it shows there will be a slight pause that will last until 2035 when a different alingment of the cycles will again cause temperature to go up. The model uses 1650 AD as the base year with a world temperature estimated to be around 13.5 degrees back then. The model works because it correctly uses the three observed movements in global temperature. Unfortunately since these movements greatly exceed human life times they can be ignored by politicians that use the hysteria that they generate to get laws that give them power over the people. All this is for COP21 at the end of the year.
The source? “Possible artifacts of data bias in the recent global surface warming hiatus,” published this week in Science, by long-time global warming alarmist Tom Karl et al.
Much study has been devoted to the possible causes of an apparent decrease in the upward trend of global surface temperatures since 1998, a phenomenon that has been dubbed the global warming “hiatus.” Here we present an updated global surface temperature analysis that reveals that global trends are higher than reported by the IPCC, especially in recent decades, and that the central estimate for the rate of warming during the first 15 years of the 21st century is at least as great as…
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