Must read of the day!!!-----Climategate, the sequel: How we are STILL being tricked with flawed data on global warming

Climategate, the sequel: How we are STILL being tricked with flawed data on global warming - Telegraph:
Something very odd has been going on with the temperature data relied on by the world's scientists, writes Christopher Booker"

...Puzzled by those “2014 hottest ever” claims, which were led by the most quoted of all the five official global temperature records – Nasa’s Goddard Institute for Space Studies (Giss) – Homewood examined a place in the world where Giss was showing temperatures to have risen faster than almost anywhere else: a large chunk of South America stretching from Brazil to Paraguay.

Noting that weather stations there were thin on the ground, he decided to focus on three rural stations covering a huge area of Paraguay.
Giss showed it as having recorded, between 1950 and 2014, a particularly steep temperature rise of more than 1.5C: twice the accepted global increase for the whole of the 20th century.

But when Homewood was then able to check Giss’s figures against the original data from which they were derived, he found that they had been altered. Far from the new graph showing any rise, it showed temperatures in fact having declined over those 65 years by a full degree. 

When he did the same for the other two stations, he found the same. 
In each case, the original data showed not a rise but a decline.

Homewood had in fact uncovered yet another example of the thousands of pieces of evidence coming to light in recent years that show that something very odd has been going on with the temperature data relied on by the world's scientists. 

And in particular by the UN’s Intergovernmental Panel on Climate Change (IPCC), which has driven the greatest and most costly scare in history: the belief that the world is in the grip of an unprecedented warming.

How have we come to be told that global temperatures have suddenly taken a great leap upwards to their highest level in 1,000 years?

In fact, it has been no greater than their upward leaps between 1860 and 1880, and 1910 and 1940, as part of that gradual natural warming since the world emerged from its centuries-long “Little Ice Age” around 200 years ago.

This belief has rested entirely on five official data records.

....One surprise is that the three surface records, all run by passionate believers in man-made warming, in fact derive most of their land surface data from a single source. 

This is the Global Historical Climate Network (GHCN), managed by the US National Climate Data Center under NOAA, which in turn comes under the US Department of Commerce.

But two aspects of this system for measuring surface temperatures have long been worrying a growing array of statisticians, meteorologists and expert science bloggers. 

One is that the supposedly worldwide network of stations from which GHCN draws its data is flawed. 

Up to 80 per cent or more of the Earth’s surface is not reliably covered at all. 

Furthermore, around 1990, the number of stations more than halved, from 12,000 to less than 6,000 – and most of those remaining are concentrated in urban areas or places where studies have shown that, thanks to the “urban heat island effect”, readings can be up to 2 degrees higher than in those rural areas where thousands of stations were lost....

...One of the more provocative points arising from the debate over those claims that 2014 was “the hottest year evah” came from the Canadian academic Dr Timothy Ball when, in a recent post on WUWT, he used the evidence of ice-core data to argue that the Earth’s recent temperatures rank in the lowest 3 per cent of all those recorded since the end of the last ice age, 10,000 years ago.

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