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Before the signing of the contract , a number of environmental organizations , including Greenpeace penned a letter to the regents , which was read during the regents meeting on on November 2 , 2007 , which stated " The prospect of giant carbon polluters directing research related to and gaining control of key energy technologies is very troubling - especially when the research is conducted at , and the technologies are developed in collaboration with , public institutions .
 Greenpeace
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Greenpeace