If you are a government or academic climate scientist, you can (and will) use a variant of this trend line for graphing any and all climate phenomena.
Disrupting the Borg is expensive and time consuming!
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Looks like you cherry picked your end points – the actual trend over the last 1.5 cycles is up.
Or maybe 1.25 cycles.
Their trend lines have direct correlation to funding levels.
Surely, that’s the Arctic ice trend line; the grant income trend line and the temperature trend line go the other way.
They usually use the 270° to 90° (4π/3 to π/2) trend with sine functions but a good hockey stick really needs to curve fit the tangent function of 270° to 90°… kind of like NOAA’s “adjustment” trendline.