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Forest-based biomass projects has received criticism for ineffective GHG mitigation from a number of environmental organizations , including Greenpeace ( who in early 2000 's were early supporters of biomass but changed their position by end of the decade ) and the Natural Resources Defense Council .
 Greenpeace, Natural Resources Defense Council
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, Natural Resources Defense Council