
Image source.
Man-made climate change is real, and the most urgent, known threat to our civilization. Mountains of scientific evidence say as much, and I have never seen a convincing argument to the contrary. Not one. What makes me an authority? Nothing. I'm just an average Joe without an advanced degree (BS Comp. Sci.). However, here's what distinguishes me from denier trolls: I trust and understand scientific consensus. That's my big secret ;). G'head, trolls, try to prove me wrong. And good luck.
Understanding The Hiatus
"The global warming hiatus is easy to understand.
It is much harder for NOAA to tamper with post 1979 global data, because we now have satellite data – which restricts the amount of cheating which they can do."


I thought I’d update that analysis to include July’s and August’s temperatures. To my surprise, NASA’s entire temperature record, going back to January 1880, changed between NASA’s June update and its August update. I could not just add two more numbers to my spreadsheet. The entire spreadsheet needed to be updated.
NASA does summarize its "updates to analysis," but the last update it describes was in February. The data I looked at changed sometime after early July.
In short, the data that NASA makes available to the public, temperatures over the last 130 years, can change at any time, without warning and without explanation. Yes, the global temperature of January 1880 changed some time between July and September 2012.
February 17, 2012: The analysis was redone on Feb 17 after learning from NOAA/NCDC that the operational version of GHCN v3 was only made available that afternoon.
September 26, 2012: NOAA/NCDC replaced GHCN v3.1 by GHCN v3.2. Hence the GISS analysis is based on that product starting 9/14/2012. Version v3.2 differs from v3.1 by minor changes in the homogenization of the unadjusted data. A description of the modifications in the adjustment scheme and their effects are available here.
The software used to perform operational updates and reprocessing of GHCN-M version 3 was modified to correct coding errors and to improve its run-time efficiency. In particular, coding errors were corrected in the Pairwise Homogenization Algorithm (PHA) that had been identified during the course of a project led by Mr. Daniel Rothenberg in July 2011...These software changes were combined with other minor changes to improve debugging and processing efficiency. A total of eight software modifications were made...With v3.1.0, the adjusted annual global land surface air temperature trend for 1901‐2011 was 0.94°C/Century. Using data from version 3.2.0 this trend is 1.07°C/Century.
The software used to perform operational updates of GHCN-M version 3 was modified to improve its run-time efficiency...The impact on annual means resulted in a change in century-scale global and US trends of less than 0.002°C/Decade. The software modifications are incorporated into a new release of GHCN-M, version 3.1.0.
I apologize for forcing NASA to do this 15 years ago, via my evil retroactive witchcraft.


"Dr. Walt Meier at NSIDC has convinced me this week that their ice extent numbers are solid... It is clear that the NSIDC graph is correct, and that 2008 Arctic ice is barely 10% above last year – just as NSIDC had stated."
"Over the past 15 years, NASA and NOAA have turned a long term US cooling trend into a warming trend. But it is even worse than that, because almost every year they make the past cooler and the present warmer."
"These alterations are being made by government employees with a strong vested interest in global warming, who should recuse themselves because of their overt conflict of interest. Their boss, the President of the United States, has made it clear that he will not accept any data which does not promote global warming theory. That is pretty strong motivation to generate warming data."

"NOAA does have discussions on obscure web pages describing their thought process behind the alterations, but few people know about this. The alterations are highly subjective, and could just as easily go the other way – making the present cooler due to urban heat island effects."
Because these data are primarily intended for the study of climate variability and change, observations have been adjusted to account for the artificial effects introduced into the climate record by factors such as instrument changes, station relocation, observer practice changes and urbanization. Some of the more current data provided by the Climate at a Glance system are preliminary and may be modified after appropriate quality control has been performed. As a result, some values available on this site differ from the official observations.
Progressives say there are no government conspiracies, which explains why Edward Snowden rocked the world with his disclosures.