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Over the past century, certain classes of chemicals were manufactured which remained present in the environment long after their usefulness had ended. When first developed, many of these substances were thought to be harmless or even beneficial, but later research revealed them to have unintended consequences. Though valuable in their day, persistent pollutants—particularly those with uncertain effects on public health—have become long-term environmental problems.

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Date Of Record Release 2008-09-24 17:00:04
Description Over the past century, certain classes of chemicals were manufactured which remained present in the environment long after their usefulness had ended. When first developed, many of these substances were thought to be harmless or even beneficial, but later research revealed them to have unintended consequences. Though valuable in their day, persistent pollutants—particularly those with uncertain effects on public health—have become long-term environmental problems.
Classification
Resource Type
Format
Source Academy of Natural Sciences
Keyword PCBs
Date Of Record Creation 2008-09-24 16:47:59
Education Level
Date Last Modified 2008-09-24 17:00:04
Language English
Date Record Checked: 2008-09-22 00:00:00 (W3C-DTF)

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