The evidence on most environmental pollutants (lead in the air and water, sulfur in the air, etc.)

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The evidence on most environmental pollutants (lead in the air and water, sulfur in the air, etc.) is that

a. They are not nearly as harmful as once thought.

b. They are increasing at an alarming rate.

c. They have decreased substantially in the last 20 years.

d. They have stabilized in the air at their all-time high.

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