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In recent statements , three top environmental experts -- Fred Krupp , the executive director of Environmental Defense , and Jonathan Lash , the president of the World Resources Institute and James Gustave Speth , the dean of Yale 's School of Forestry and Environmental Studies -- have stopped well short of embracing nuclear power , but they have emphasized that it is worth trying to find solutions to the economic , safety and security , waste storage and proliferation issues rather than rejecting the whole technology .
 person of company: James Gustave Speth, World Resources Institute; person of company: Jonathan Lash, World Resources Institute
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  James Gustave Speth, World Resources Institute; Jonathan Lash, World Resources Institute 
Answer:
 person of company: James Gustave Speth, World Resources Institute; person of company: Jonathan Lash, World Resources Institute