Rewriting The Climate At NASA

NASA GISS v4 shows more than 2C warming over land since 1880.

graph.png (1130×700)

A different version of the same V4 graph also shows about 1.6C warming over land since 1880. This graph used to be linked to from their website, but I can no longer find any links. However the graph is still present on their website.

graph.png (1130×600)

The red lines in both of the graphs above should be identical, but they aren’t. Here is an animation showing how they are altering the land data in the new graph vs. the old graph. They have increased recent temperatures by about 0.3C and cooled past temperatures by about the same amount.


The person in charge at NASA (Gavin Schmidt) has me blocked on Twitter, but Tom Nelson questioned him about this change. This is how he responded.

6:17 AM · Apr 1, 2021

He does tweet in a colorful mask however.

But the data tampering story gets much worse. In 1974, the National Center for Atmospheric Research showed no net warming from 1870 to 1970, with the warmest decade being the 1940s, followed by a sharp cooling.

21 Jul 1974, 13 – The Des Moines Register at

This cooling was confirmed in NOAA Magazine October, 1974


In 1978, the New York Times confirmed the cooling trend was continuing.

International Team of Specialists Finds No End in Sight to 30‐Year Cooling Trend in Northern Hemisphere – The New York Times

But NASA has since erased the post-1940 cooling.

In this Climategate email, climate scientists from different agencies discussed their desire to remove the 1940s warmth.

In 1981, NASA did show a 1940s blip followed by 0.3C cooling. They also showed a Medieval Warm Period and a Holocene Optimum.

1981 version

Michael Mann later erased the Medieval Warm Period.


And the post 1940s cooling has since been erased by NASA.

As of the year 2000, NASA showed no net warming from 1870 to 1979, with 1878 being the warmest year.

But they now hide data before 1880, and show about 0.7C warming prior to 1980

This animation shows how they have altered the data

The 1878 warmth is important because the Atlantic Multidecadal Oscillation peaked in 1878, and produced record warmth and global drought.

Wood for Trees: Interactive Graphs

There was no winter in Minnesota that year.

19 Mar 1878, Page 2 – Star Tribune at

Australia had record heat.

14 Jan 1878 – Great Heat in the Interior. – Trove

China had a famine which killed nearly ten million people.

15 Jun 1931, Page 6 – Montana Butte Standard at

And there was universal drought.

28 Jan 1878 – UNIVERSAL DROUGHT. – Trove

29 Jan 1878, Page 7 – The Sydney Morning Herald at

31 Jan 1878, Page 7 – The Sydney Morning Herald at

24 Jan 1878, Page 7 – The Sydney Morning Herald at

02 Mar 1878, 6 – Daily News at

07 Jun 1878, Page 7 – The Sydney Morning Herald at

12 Jun 1877, 4 – Express and Standard at

This didn’t suit the agenda of climate alarmists, so Michael Mann is now trying to erase the AMO.

The Rise and Fall of the “Atlantic Multidecadal Oscillation” | MICHAEL E. MANN

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9 Responses to Rewriting The Climate At NASA

    • CO2 is a greenhouse gas, only the greenhouse effect is a myth, based on the strange idea that gases can absorb IR, but not re-radiate it.

      • Arn says:

        It ‘s a greenhouse gas as much as helium is a balloon gas,and both terms dont say a thing about the attributes of the atoms and molecules,
        nor would anyone claim that a reflecting whatever(as long as it is not a closed system,as eg a greenhouse,which stays warm because of the glass isolation and not the co2 ) inside a tiny 50km atmosphere could have a significant delay on electromagnetic waves that travel with 300000 km per second.

        Greenhouse gas or not,main thing is how much matter /gas light has to pass(and 0.01% are about 99.99 irrelevant to climate) on the way through atmosphere.Thats why 95% co2 atmosphere mars is supercold instead of superhot.
        Pre political scientists knew this so well,that they didnt gave a crap about atmospherical greenhouse gas increase when they started the ice age scare,
        and they instantly became agw zealots and greenhouse gas experts the day they were told that only agw will feed their parasitic needs.

      • S.K. says:

        The latest experiment says otherwise.

        Where is the experimental evidence that quantifies co2 climate sensitivity? If does not exist.

  1. Steve Case says:

    The 1878 warmth is important because the Atlantic Multidecadal Oscillation peaked in 1878, and produced record warmth and global drought.

    Thanks for posting that tidbit, I’ve been following temperature trends for a long time, and I’ve always wondered about that 1878 spike.

  2. I suppose it is because there is so much apocalyptic nonsense bandied about, that a billionth of a degree temperature change signals the end of life on Earth, that this data tampering is a cause of concern. Considering the massive temperature swings over geological time, whose peaks actually benefited life on Earth, I remain sanguine even if the fiddled data were correct. There is no justification in these plots for the idiot ‘zero carbon’ policy.

  3. rah says:

    Mann is a liar of course. The AMO after dropping a bit is currently more or less static in positive territory. It is quite normal for the AMO to plateau during it’s cycles before continuing it’s trend and that trend now is down as past cycles indicate it should be.

    Mann is relying on time for people to forget his lie like so many others snake oil salesmen of climate doom do. Or at least those that have any sense, leaving out the likes of Hayho and Dressler.

  4. Arn says:

    Gavin shows that he thinks his followers are childish.
    Communicating with emojis and a colored mask- kindergarten style.

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