"I think today we recognize that economic activity needs to search for ways to protect the environment."

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There is a close connection between socio-political development, the struggle between social classes and the history of ideologies. In general, intellectual movements closely reflect the trends of economic developments. In communal society, where there are virtually no class divisions, man's productive activities on outlook and culture is less discernible. Account must be taken of the psychology of conflicting classes.

— Kwame Nkrumah