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However , across large areas of the oceans such as the Southern Ocean , phytoplankton are limited by the lack of the micronutrient iron. This has led to some scientists advocating iron fertilization as a means to counteract the accumulation of human-produced carbon dioxide ( CO ) in the atmosphere .
 location: Southern Ocean; food: micronutrient
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Southern Ocean, micronutrient 
Answer:
 location: Southern Ocean; food: micronutrient