"A realization of the inter-relationships within an ecosystem is essential for man’s continued occupancy on earth. We cannot go on polluting our air or our rivers without affecting all life. We cannot, for example, continue with impunity to increase the carbon dioxide content of the atmosphere at the rate it has been increased over the past fifty years. The consequences of such interference with the biosphere, the world ecosystem, would be disastrous climatic change."

–Raymond F. Dasmann, A Different Kind of Country (1968)
 

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