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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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