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5000 Years Of Climate Change From Greenland Ice Cores

Top climate scientist, Phil Jones, who is closely associated with the IPCC, told the BBC:

the warming rates from 1860-1880, 1910-1940 and 1975-1998 are similar and not statistically significantly different from each other.


But man’s CO2 emissions during those three warm periods were dramatically different ranging from  91 MT(1) to 4596 MT(1)

Therefore increased emission of  CO2  DID NOT increase the warming rate since all three were statistically the same.


Details:











Here is the complete BBC question and Phil jones’ complete answer:

A - Do you agree that according to the global temperature record used by the IPCC, the rates of global warming from 1860-1880, 1910-1940 and 1975-1998 were identical?


An initial point to make is that in the responses to these questions I've assumed that when you talk about the global temperature record, you mean the record that combines the estimates from land regions with those from the marine regions of the world. CRU produces the land component, with the Met Office Hadley Centre producing the marine component.


Temperature data for the period 1860-1880 are more uncertain, because of sparser coverage, than for later periods in the 20th Century. The 1860-1880 period is also only 21 years in length. As for the two periods 1910-40 and 1975-1998 the warming rates are not statistically significantly different (see numbers below).


I have also included the trend over the period 1975 to 2009, which has a very similar trend to the period 1975-1998.


So, in answer to the question, the warming rates for all 4 periods are similar and not statistically significantly different from each other.     

Read the whole Q & A set here


CO2 emissions data:

CO2 emissions data is annual metric tons from this Oak Ridge National Labs file:


http://cdiac.ornl.gov/ftp/ndp030/global.1751_2010.ems


Compelling Evidence That CO2 Did Not Cause Rapid Warming

Man’s CO2 emissions for 3 identical warm periods

Warm Period

Emissions at start

Emissions at end

1860-1880

91

236

1910-1940

819

1299

1975-1998

4596

6643




CO2 in metric tons of carbon  from:

http://cdiac.ornl.gov/ftp/ndp030/global.1751_2010.ems

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