"To a large degree, we are still bound to the modern scientific spirit, that characterizes reality merely by its material and mechanic aspects, without including life, consciousness and the intimate communion with that which poets, musicians and artists bring us in their magnificent works."

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Perhaps the simplest example is a synthetic plastic, which unlike natural materials, is not degraded by biological decay. It therefore persists as rubbish or is burned-in both cases causing pollution. In the same way, a substance such as DDT or lead, which plays no role in the chemistry of life and interferes with the actions of substances that do, is bound to cause ecological damage if sufficiently concentrated.

— Barry Commoner