JoNova A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).
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Fans of man-made global warming frequently tell us seas are rising, but somehow forget to mention the rise started 200 years ago, long before our coal-fired electricity plants cranked up, and long before anyone had an electric shaver, or a 6 cylinder fossil-fuel-spewing engine. Something else was driving that warming trend.
Here is the data from tide gauges going back 300 years from a paper by Jevrejeva et al 2008.
[Graphed by Joanne Nova based on data from Jevrejura et al located at this site PMSML]
This graph was calculated from 1023 tide gauge records [Jevrejeva et al., 2006] going back to 1850.The 2008 study extended the record further using three of the longest (though discontinuous) tide gauge records available: Amsterdam, since 1700 [Van Veen, 1945], Liverpool, since 1768 [Woodworth, 1999] and Stockholm, since 1774 [Ekman, 1988]. Obviously since there are only three old records, the error bars are a riot.
The Jevrejeva paper is also useful for portraying the 60 year rolling cycle. The regular ups and downs are obvious when the rate of change is plotted (see below).
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Qassiarsuk: This is the site of the Viking settlement of 972 and unlike much of Greenland, offers relatively sheltered grazing land for sheep. Photo: John McLean. (Click to see more images of Greenland).
For the first time temperatures over the last 5,600 years have been reassembled from the inhabited area of Greenland. (Other estimates were from ice-cores that are far inland.)
William D’Andrea, the paper’s first author says: “.. we can say there is a definite cooling trend in the region right before the Norse disappear.”
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A Scene on the Ice by Hendrick Avercamp, circa 1600
Dennis Avery reminds us of just how painfully cold the Little Ice Age was (see below) and also pointed me to this excellent historical description:
The Great Irish Frost of 1740, Longest Period of Extreme Cold in Modern European History
Biot Report #442:July 13, 2007
An extraordinary climatic shock—the Great Frost—struck Ireland and the rest of Europe between December 1739 and September 1741, after a decade of relatively mild winters. Its cause remains unknown. Charting its course sharply illuminates the connectivity between climate change and famine, epidemic disease, economies, energy sources, and politics. David Dickson, author of Arctic Ireland (1997) provides keen insights into each of these areas, which may have application to human behaviors during similar future climatic shocks. The crisis of 1740-1741 should not be confused with the equally devastating Great Potato Famine in Ireland of the 1840s.
Though no barometric or temperature readings for Ireland (population in 1740 of 2.4 million people) survive from the Great Frost, Englishmen were using the mercury thermometer invented 25 years earlier by the Dutch pioneer Fahrenheit. (1) Indoor values during January 1740 were as [...]
The public might not understand the science, but they do understand cheating
Dr. David Evans
6 October 2010
[A series of articles reviewing the western climate establishment and the media. The first and second discussed air temperatures, the third discussed ocean temperatures, and the fourth discussed past temperatures.]
Click to download a pdf file containing the whole series
Notice How They Never Directly Compare Temperature With Human Emissions of CO2?
According to the man-made theory of global warming promoted by the western climate establishment, the recent global warming is due to human emissions of greenhouse gases, which are dominated by carbon dioxide (CO2).
So let’s compare the alleged cause (human emissions of CO2) with the alleged effect (temperature).
Human emissions of CO2 have been estimated from historical data for the period 1751 (before the industrial revolution) to 2007 for the major sources—coal, gas, and petroleum use, cement production, and gas flaring—by the Carbon Dioxide Information Analysis Center within the US Department of Energy. (The cumulative figures below extrapolate to 2010 using average annual emissions for the previous 14 years.)
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The public might not understand the science, but they do understand cheating
Dr. David Evans
6 October 2010
[A series of articles reviewing the western climate establishment and the media. The first and second discussed air temperatures, the third discussed ocean temperatures.]
Click to download a pdf file containing the whole series
They Don’t Tell You: The Current Global Warming Trend is Over 300 Years Old
A Scene on the Ice by Hendrick Avercamp, circa 1600
Satellite data only goes back to 1979, and global land-thermometer records only go back to 1850. Before that we have to resort to “proxies”, which are various natural phenomena from which temperature can be deduced. As we go further back in time, the errors and uncertainties increase.
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Guest post by Dr David Evans PDF at sciencespeak.com
Now that ClimateGate has buried the fraudulent hockey stick for good, it is easy to prove that global warming is not man-made: just compare the timing of our carbon dioxide emissions with the timing of global warming.
Human Emissions of Carbon Dioxide
Emissions of carbon dioxide by humans are easy to estimate from our consumption of coal, oil, and natural gas, and production of cement:
Figure 1: Carbon emissions by humans. Source: Carbon Dioxide Information Analysis Center.
The vast bulk of human emissions occurred after 1945, during post-WWII industrialization. Half of all human consumption of fossil fuels and cement production has occurred since the mid 1970s.
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A big news day. It appears Steve McIntyre (volunteer unpaid auditor of Big-Government-Science) has killed the Hockey Stick a second time…
The details are on the last three days of Steve McIntyre’s site Climate Audit, and summed up beautifully on Watts Up.
The sheer effrontery and gall appears to be breathtaking.
The Briffa temperature graphs have been widely cited as evidence by the IPCC, yet it appears they were based on a very carefully selected set of data, so select, that the shape of the graph would have been totally transformed if the rest of the data had been included.
Kieth Briffa used 12 samples to arrive at his version of the hockey stick and refused to provide his data for years. When McIntyre finally got hold of it, and looked at the 34 samples that Briffa left out of his graphs, a stark message was displayed. McIntyre describes it today as one of the most disquieting images he’s ever presented.
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Click for a larger (powerpoint size) image
The world has not warmed since 2001.
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Just as the great bull run that could have no end, ended, another unthinkably big bubble quivers. Technical indicators are quietly being tripped that suggest the bull run in global temperatures may be toying with a reversal. Could another large human institution dependent on complex models be headed for it’s ‘Lehman Bros’ moment? [...]
This is a Guest Post by Dr David Evans
The big temperature picture. Graph and insight from Dr Syun Akasofu (2009 International Conference on Climate Change, New York, March 2009).
The global temperature has been rising at a steady trend rate of 0.5°C per century since the depths of the little ice age in the 1700s (when the Thames River would freeze over every winter; the last time it froze over was 1804). On top of the trend are oscillations that last about thirty years in each direction:
1882 – 1910 Cooling 1910 – 1944 Warming 1944 – 1975 Cooling 1975 – 2001 Warming
In 2009 we are where the green arrow points, with temperature leveling off. The pattern suggests that the world has entered a period of slight cooling until about 2030.
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