Yep, cooked data. Guess where the thermometers they are currently relying on to get the temps are located - in cities, at airports, etc.
In other words, HEAT SINKS. Concrete jungles, over macadam at the airports, etc. I remember reading about the change of locations of the thermometers in the mid 80s. - away from greener areas to 'more easily accessible areas.'
I'm also old enough to remember my grade school teachers (early 70s) preaching at me about us heading into the next ice age shortly, how acid rain was going to kill every lake and all our lawns by 2000, and how the fuel supplies would also be exhausted around that time.
You might also remember the scandal about "decorator colored toilet paper". The Tree Hugers of that era shamed everyone into using white paper because the dyes used to color the paper was poisoning the water supply. After everyone started using only white, they found the water quality actually declined due to the bleach used to make the paper white.
Also, you will recall that Veggies and Fish were full of Goodness...except for fish like salmon, cat fish, and the other fish that were full of fat. Same with the veggies...stay away from broccoli, cauliflower, brussels sprouts, cabbage cause, in a betrayal to all things good, those veggies were loaded with fat.
Now, of course, those are the fish and veggies very highly recommended because of the very beneficial effects of the fats they contain.
Seems like lots of folks need to have a "cause" for some reason.