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Biological productivity = amount of living matter produced per unit area. You need to look at the oceans as well as the land.
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I'm okay with that. But after googling for "high latitude biological productivity", I haven't seen anything thus far that supports the idea that "Biological productivity is highest in the Arctic and Antarctic oceans..." In fact, as pertinent to this discussion, I did find this abstract:
SHIFTING OCEAN PRODUCTIVITY PATTERNS DURING THE INTENSIFICATION OF NORTHERN HEMISPHERE GLACIATION. In the abstract, it states that "We find that biological productivity in all high latitude regions declines precipitously in association with the intensification of (Northern Hemisphere Glaciation)." So that I might better understand, please point me to your source.