"Perhaps one of the most meaningful ways to sense the impact of the environmental crisis is to confront the question which is always asked about Lake Erie: how can we restore it? I believe the only valid answer is that no one knows. For it should be clear that even if overnight all of the pollutants now pouring into Lake Erie were stopped, there would still remain the problem of the accumulated mass of pollutants in the lake bottom."

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It is much easier to make intellectual messes than it is to clarify complicated issues, especially when real solutions would challenge the status quo and require much careful thought across many fields of knowledge. Problems of climatic change, biotic impoverishment, population growth, and the choices to be made by various technologies and the transition to a sustainable and decent society with an economy that works over the long-term are difficult, complex, and intertwined problems with many possible answers.

— David W. Orr