The Peruvian government claims that nearly 900 dolphins died of natural causes. A separate study disagrees.
In what is considered a crazy plan to slow desertification, countries across Africa are planting a wall of Acacia trees.
Like Ireland's potato in the 19th century, African cassava is under attack from a disease that may put poor farmers at risk to famine.
Tiny particles of air pollution may be an important factor in America's worsening diabetes epidemic.
Big, old trees provide irreplaceable habitat for many animals.
The bacterial infection is rapidly outpacing efforts to help Haitians who are desperate for answers and solutions.
Keeping seafood safe for consumers requires testing imports for unapproved drugs. Should buyers be given the information about the origins of their seafood and make the call themselves?
Dallas hadn't sprayed for mosquitoes since 1966, and some are concerned about the health and environmental risks posed by the new insecticide Duet.
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