I think this rates as propaganda. You are mixing things up as usual. Are we talking about temperature stations or urban areas? Who says we put temperature stations in urban areas? Good grief.
Ensuring the accuracy of Earth’s long-term global and regional surface temperature records is a challenging, constantly evolving undertaking. There are lots of reasons for this, including changes in the availability of data, technological advancements in how land and sea surface temperatures are...
climate.nasa.gov
We don't know how accurate temperature estimates of 2000 years ago are.
What is a fact is that the Arctic Ice Cap has shrunk by 50% since the 1950's:
"The Arctic sea ice has been declining rapidly over the past few decades, with the minimum extent of sea ice in September (the end of the melt season) declining at a rate of about 12.8% per decade since satellite observations began in 1979. The Arctic sea ice extent in September 2021 was 4.72 million square kilometers, which is 38% below the 1981-2010 average and one of the lowest extents on record.
The Arctic sea ice has been shrinking even faster in the past 70 years, with studies indicating that the summer sea ice extent in the Arctic may have declined by as much as 50% since the 1950s. While estimates of past sea ice extent rely on proxy data such as ice cores, tree rings, and sediment cores, satellite observations over the past few decades provide more direct and accurate measurements of sea ice extent." (ChatGPT)
And Greenland glaciears are shrinking fast as well.
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