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Prime Minister John Howard announced the national targets yesterday , requiring that by 2020 , 30,000 gigawatt hours of electricity each year comes from low emissions sources .
 John Howard
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:
 John Howard