93872
Research published in 2014 suggests that below Greenland 's Russell Glacier 's ice sheet , methanotrophs could serve as a biological methane sink for the subglacial ecosystem , and the region was at least during the sample time , a source of atmospheric methane .
 location: Greenland; location: Russell Glacier
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: Greenland, Russell Glacier 
Answer:
 location: Greenland; location: Russell Glacier