The hits just keep coming for the climate hysterics. I have explained before how the temperatures that aAre measured by various methods and instruments and then “adjusted”. Somehow the adjustments always seem to support the hysteric narrative that human emissions of CO2 have caused immense warming. One of the favorite hysteric adjustments is something called homogenization, which in my skeptical, maybe even cynical, worldview is designed to take urban heat effect temperatures from cities and spread those artificially high temperatures into surrounding areas. A new study looks at the National Oceanic and Atmospheric Administration homogenization practices. The study found that few of the adjustments were made consistently across temperature measurement sites and few could be explained or justified. Homogenization is intended to correct for items like changing the thermometer type at a station or the time of measurement, so it could be an important adjustment to ensure accurate measurement of temperature trends. But humans are doing the homogenizing and they tend to impose their own biases on the process and you can guess which way those biases run. (Homogenization Study)
Somewhat similar study behavior with this Glacier retreat study covering 1850-2010 claiming substantial increase in glacier melt late 20th century and early 21st century. A conclusion with high confidence level while less than 20% data coverage during the study period. North American lacking data covering about 60% of the study period in spite of NA have some of the better historical records.
https://www.cambridge.org/core/journals/journal-of-glaciology/article/historically-unprecedented-global-glacier-decline-in-the-early-21st-century/2F1E3ACB111A03F9BA83D11439F5D681
Bottom line – use of incomplete or manipulated data is never scientific.