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Others ( e.g. , Lawrence Becker ) have explored the intuitive idea that acting on behalf of future generations may be required as a generalized form of reciprocity for benefits received from previous generations .
 Lawrence Becker
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:
 Lawrence Becker