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Non-persistent and persistent pesticides are equally dangerous, but non-persistent has immediate impacts whereas persistent pesticides wield long-term effects.

Specifically, non-persistent pesticides include the super-powerful organophosphate malathion. They may impact people and wildlife for hours to weeks until they degenerate. In contrast, chlorinated hydrocarbons represent prime examples of persistent pesticides which survive for months to decades in the environment.

It is the difference between immediate, sudden death or disability and long-term, protracted fatalities.

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