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This definition has been criticized by Kevin Kelly who believe such a principle is ill-defined So rather than conceived as imposing no change until proof of safety is produced , this definition of the precautionary principle is meant to legitimate protective measures , attempting to avoid the desire of a technology 's advocates to delay legislation until irrefutable evidence of harm can be produced .
 Kevin Kelly
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:
 Kevin Kelly