Comment on Berkeley Surface Temperatures: Released by DocMartyn

Steve, I have always thought that places that have been known to have had changes in the period of interest should be used as a positive control. USAAF/USAF bases that swelled in WWII, then had runway extensions in the 50′s, then were run down, increased in 80′s and then closed post-Berlin War would be a good start.
On the other hand, I am sure there mus be land grant agricultural universities, like MSU, that have farming research stations that have records of crop changes in different areas would also be useful.
The lack of positive/negative controls sickens me.
As for scouting out locations, hell the Boy Scouts of America have 4.5 million youth members, they all want badges.
You could do a deal with the BSA and get every location scouted, along with precision GPS coordinates and photographs inside a year.