"The whole economy of this lower world proves that it is by labor and perseverance only that good is obtained and evil is avoided."

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Because the global ecosystem is a connected whole, in which nothing can be gained or lost and which is not subject to over-all improvement, anything extracted from it by human effort must be replaced. Payment of this price cannot be avoided; it can only be delayed. The present environmental crisis is a warning that we have delayed nearly too long.

— Barry Commoner