A reader writes in to take issue with claims I've made that there has been no warming of the Earth in recent years. The reader includes a link to this video to somehow debunk the idea.
It struck me immediately that the video depends entirely on the data from NASA to make its case. But the NASA temperature is always much higher than the other sources of data. Here they all are, compared.

It's a bit messy, so here is the same chart, but this time, the average temperature of each line is the same, so that we can see just their signals.

You can see how the data from NASA, when it's compared to the other three, shows less warming in 1998, and more warming in the subsequent El Nino years.
This has the effect, in the video above, of making it look like things are getting worse. Is it significant that NASA's data doesn't agree with the other datasets, and makes the alarmist case? I wondered what might happen if we subtracted the temperature given by Hadley/CRU, UAH, and RSS (these sources are discussed in a previous post, HERE). This is the result.

Again, it's very messy... A tidy up.

I've also added some trend lines. UAH and RSS are virtually identical. Now we can see more clearly how GISS differs from the other datasets.
As you can see, compared to the other three datasets, NASA GISS understates the 1998 temperature and overstates the temperature in years of the post-1998 En Niños and La Ninas, especially 2005 and 2007.
We can also see how GISS increasingly diverges from the other datasets, to show a warming trend where the others do not.
I'm not going to speculate about whether or not this has been done to deliberately deceive, or is just an accident, nor which graph is the one we should believe in. All I want to say is that we should remember that there's more than one way of telling this story, and it's the people who want something from you who want to tell it just one way.
Mister Wong
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I trust these comments will appear on your website.
Anyone blogging this website should also refer to Gavin Schmidt, a climatologist at NASA GISS.
Schmidt's comments seriously contradict Godfrey Bloom's assertions.
The essense here is GB's opinions vs overwhelming scientic evidence.
Dated Sat. 13th March, 2010