Limits to Growth by Donella H. Meadows;Jorgen Randers;Dennis Meadows

Author:Donella H. Meadows;Jorgen Randers;Dennis Meadows
Language: eng
Format: mobi, epub
Published: 2008-11-29T21:04:00+00:00

FIGURE 4-9 Structural Causes of the Four Possible Behavior Modes of the World3 Model

One illustration of these delays is provided by the percolation of PCBs through the environment. Since 1929 industry has produced some two million tons of the stable, oily, nonflammable chemicals called polychlorinated biphenyls, or PCBs.8 They were used primarily to dissipate heat in electrical capacitors and transformers, but also as hydraulic fluid, lubricants, fire retardants, and constituents of paints, varnishes, inks, carbonless copy paper, and pesticides. For 40 years users of these chemicals dumped them in landfills, along roads, into sewers and water bodies, without thinking of the environmental consequences. Then in a landmark study in 1966, designed to detect DDT in the environment, Danish researcher Soren Jensen reported that in addition to DDT, he had found PCBs to be widespread as well.9 Since then other researchers have found PCBs in almost all the globe's ecosystems.

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