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milodonharlani says:
The authors made their necessary obeisance to CO2 orthodoxy (the main source of climate change), while at the same time reminding the High Priests & Archdruids of the CAGW cult (who are prepared to sacrifice not just first born sons or selected virgins but all humanity on their altar) that science still doesnt know a great deal about possible carbon sinks, along with much else regarding the mechanics of climate.
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Gary says:
Liebigs Law will apply with phytoplankton. As spring advances, light becomes less limiting and growth takes off, but then nutrients (most likely nitrogen) become the inhibitor of continued rampant growth, even if CO2 is over-abundant. Studies such as this are limited as well sort of a corollary to LL because they dont look at everything over enough time to see the big picture.