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Topic: Global Warming - within normal ranges.....

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HK_Vol

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Global Warming - within normal ranges.....
« on: August 22, 2017, 06:45:32 PM »

http://jennifermarohasy.com/2017/08/recent-warming-natural/

Most of the Recent Warming Could be Natural

SNIP:
AFTER deconstructing 2,000-year old proxy-temperature series back to their most basic components, and then rebuilding them using the latest big data techniques, John Abbot and I show what global temperatures might have done in the absence of an industrial revolution.

The IPCC comes up with a very different assessment because they essentially remodel the proxy temperature series, before comparing them with output from General Circulation Models.  For example, the last IPCC Assessment report concluded that,

“In the northern hemisphere, 1983-2012 was likely the warmest 30-year period of the last 1,400 years.” 

If we go back 1,400 years, we have a period in Europe immediately following the fall of the Roman empire, and predating the MWP.  So, clearly the IPCC denies that the MWP was as warm as current temperatures.

This is the official consensus science: that temperatures were flat for 1,300 years and then suddenly kick-up from sometime after 1830 and certainly after 1880 – with no decline at 1980.

To be clear, while mainstream climate science is replete with published proxy temperature studies showing that temperatures have cycled up and down over the last 2,000 years – spiking during the Medieval Warm Period and then again recently to about 1980 as shown in Figure 12 – the official IPCC reconstructions (which underpin the Paris Accord) deny such cycles.  Through this denial, leaders from within this much-revered community can claim that there is something unusual about current temperatures: that we have catastrophic global warming from industrialisation.

HK_Vol

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Re: Global Warming - within normal ranges.....
« Reply #1 on: August 22, 2017, 06:47:33 PM »
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