[OniBait]

I suspect it is from Tony Heller (aka Stephen Goddard). Looks like he has a blog post about it here [1]. (note: Heller is nuts so it is hard to take what he says at face value, but it would appear he has a valid point on all the temperature adjustments going on).

The NOAA does adjust the data (and continues to do so) based on various factors like time of observation (TOBS), urban heat island effect (UHI). As well as infilling data when a station drops or they don't have the coverage.

As for the global temp dropping. That is most likely based on the satellite data showing a slight decrease (the hiatus).

[1] https://stevengoddard.wordpress.com/2015/08/17/the-majority-...

[Pyxl101]

Rather than trying to fill in data that we don't have, are there models based on only the data that we actually have?