TheFunPolice wrote on Aug 7
th, 2018 at 4:42pm:
Rates of change: this has been discussed for over ten years on this forum now!
Yes. It varies doesn't it?
We had similar rates of change before.
And we had the hiatus.
"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.
Here are the trends and significances for each period:
Period Length Trend
(Degrees C per decade) Significance
1860-1880 21 0.163 Yes
1910-1940 31 0.15 Yes
1975-1998 24 0.166 Yes
1975-2009 35 0.161 Yes"
http://news.bbc.co.uk/2/hi/8511670.stmProfessor Phil Jones Director Climate Research Unit .