'Safer' pesticide could create toxic mercury, study says

A compound in pesticides that replaced another banned for its harmful effects, may threaten humans and wildlife by reacting with mercury in natural water to form a toxic chemical, researchers said Tuesday.

Shrinking habitats have adverse effects on world ecosystems

An extensive study of global habitat fragmentation - the division of habitats into smaller and more isolated patches - points to major trouble for a number of the world's ecosystems and the plants and animals living in them.

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