“Only within the moment of time represented by the present century has one species-man- acquired significant power to alter the nature of his world.
“During the past quarter century (written in 1962) this power has not only increased to one of disturbing magnitude but it has changed in character.
“The most alarming of all man’s assaults upon the environment is the contamination of air, earth, rivers, and sea with dangerous and even lethal materials.
“…chemicals sprayed on croplands or forests or gardens lie in the soil, entering into living organisms, passing from one to another in a chain of poisoning and death.
“Or they pass mysteriously by underground streams until they emerge and, through the alchemy of air and sunlight, combine into new forms that kill vegetation, sicken cattle, and work unknown harm on those who drink from once pure wells.
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