No Retraction, Just Qualification
by Kiko Matsing
Eh? Not really. Dr. Phil Jones pretty much held his ground and issued qualifications rather than outright retractions. Climate change lives!!! Let the funding continue!
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?
…So, in answer to the question, the warming rates for all 4 periods are similar and not statistically significantly different from each other…
B – Do you agree that from 1995 to the present there has been no statistically-significant global warming
Yes, but only just. I also calculated the trend for the period 1995 to 2009. This trend (0.12C per decade) is positive, but not significant at the 95% significance level…
C – Do you agree that from January 2002 to the present there has been statistically significant global cooling?
No. This period is even shorter than 1995-2009. The trend this time is negative (-0.12C per decade), but this trend is not statistically significant.
D – Do you agree that natural influences could have contributed significantly to the global warming observed from 1975-1998, and, if so, please could you specify each natural influence and express its radiative forcing over the period in Watts per square metre.
…Combining only these two natural influences [volcanoes and the Sun], therefore, we might have expected some cooling over this period.
E – How confident are you that warming has taken place and that humans are mainly responsible?
I’m 100% confident that the climate has warmed. As to the second question, I would go along with IPCC Chapter 9 – there’s evidence that most of the warming since the 1950s is due to human activity.
G – There is a debate over whether the Medieval Warm Period (MWP) was global or not. If it were to be conclusively shown that it was a global phenomenon, would you accept that this would undermine the premise that mean surface atmospheric temperatures during the latter part of the 20th Century were unprecedented?
Of course, if the MWP was shown to be global in extent and as warm or warmer than today (based on an equivalent coverage over the NH and SH) then obviously the late-20th century warmth would not be unprecedented. On the other hand, if the MWP was global, but was less warm that today, then current warmth would be unprecedented.
…We cannot, therefore, make the assumption that temperatures in the global average will be similar to those in the northern hemisphere [where MWP is known].
H – If you agree that there were similar periods of warming since 1850 to the current period, and that the MWP is under debate, what factors convince you that recent warming has been largely man-made?
The fact that we can’t explain the warming from the 1950s by solar and volcanic forcing – see my answer to your question D.
I – Would it be reasonable looking at the same scientific evidence to take the view that recent warming is not predominantly manmade?
No – see again my answer to D.