Because the opinion piece you posted mentioned it. Are you sure it's me who needs to read it?You didn't read the article.
No, you have it backwards. The US National Weather Service collects temperature data for the US. Because they own and operate all the machines in this country, and other nations have their own weather stations operated by their own weather services. I mean really, who believes the US NWS would farm that out to some British university?The CRU has the largest and most utilized temperature data base in the world, and a portion of that data is simply made up. The only mention of the software involved is to assert that the data base didn't function properly unless data was provided for every site listed. Nice attempt to deflect and change the subject. And no, the CRU isn't the only source of data - just the source for NOAA, the IPCC, and the global temperature measurements supplied to agencies like the US National Weather Service for global temperature records
The CRU collects all that data and compiles an instrumental temperature record.
There are other temperature records, like GISTemp and the satellite records, and they all match fine.