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Scholarship has increasingly tended away from Gerald L. Young 's idea of a " unified theory " of human ecological knowledge - that human ecology may emerge as its own discipline - and more toward the pluralism best espoused by Paul Shepard : that human ecology is healthiest when " running out in all directions . " .
 Gerald L. Young, Paul Shepard
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:
 Gerald L. Young, Paul Shepard