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The twentieth century saw the biocentric moral vision that focuses on the health of the ecosystem as theorized by Aldo Leopold , which led to the expansion of federally protected areas and to the surrounding ecosystems .
 person: Aldo Leopold
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Aldo Leopold 
Answer:
 person: Aldo Leopold