Already addressed above a couple years ago, but worth a revisit:
Dr. Rui Ying, the lead author and a PhD student in marine ecology at the University of Bristol, emphasized the urgency of the situation. He stated that even under conservative climate projections predicting a 2°C rise, it is evident that plankton cannot keep pace with the rapid warming we are experiencing, which shows no signs of slowing down.
“Plankton are the lifeblood of the oceans, supporting the marine food web and carbon storage. If their existence is endangered, it will present an unprecedented threat, disrupting the whole marine ecosystem with devastating wide-reaching consequences for marine life and also human food supplies.”