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How efficient pv solar power?

Hey everyone I am making a survey so I find that it is the best place to complete my survey because here i can get views of all of you. So I need to know that How efficient is pv solar power, What effect does solar energy have on the environment both positively and negatively? I am expecting a straight forward answer from you guys so no need to mold your answer. Please give you views I will appreciate. Thanks!