This plot, apart from anything else, shows how much uncertainty there is in measuring global temperatures, even within the last decade, when the major datasets can’t agree on the sign, let alone the magnitude of the trend.
As this ClimateGate email admits, cooling has been shown since 1998. But they couldn’t admit it.
From: Phil Jones
To: John Christy Subject: This and that
Date: Tue Jul 5 15:51:55 2005
John,
There has been some email traffic in the last few days to a week - quite
a bit really, only a small part about MSU. The main part has been one of
your House subcommittees wanting Mike Mann and others and IPCC
to respond on how they produced their reconstructions and how IPCC
produced their report.
In case you want to look at this see later in the email !
Also this load of rubbish !
This is from an Australian at BMRC (not Neville Nicholls). It began from the attached
article. What an idiot. The scientific community would come down on me in no uncertain terms if I said the world had cooled from 1998. OK it has but it is only 7 years of data and it isn't statistically significant.