Today, these studies are done with high- resolution(≤2km) satellites that measure surface temperature globally. The comparison is usually the average of all measured surface temperatures across the globe. So they"re referring to the average surface temperature of the Earth, not your backyard. Locally, the lower 48 had the 42nd warmest year on record for average surface temperature, and there is also variation by region within that area.
Now obviously, we have not had expensive satellites with capable instrumentation since the official record began. So as you go back to 1880 surface temperature was measured at observation stations by hand. Which was biased because in 1880 those observations were made in areas that were easily accessible by foot/car/ship, and also at lower resolution globally than today"s satellite data. There is uncertainty there that must be accounted for.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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