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 CommonerTechnologists practice faith too; 'Faith that problems have solutions before having the knowledge to solve them.'
Barry CommonerIn general, any productive activity which introduces substances foreign to the natural environment runs a considerable risk of polluting it.
Barry Commoner