Aquatic sediment layers reveal 100 years of metal pollution in Sao Paulo, Brazil / Study shows 90% metal pollution drop in Adirondack waters five decades after the clean air act / Major rice producers have world's worst heavy metal pollution, Chinese scientists warn / Biodiversity in England's rivers found to have improved as metal pollution reduced / Falcons exposed to heavy metals are a red flag for environmental health / Metal mines pollution raises health worries / The first assessment of toxic heavy metal pollution in the Southern Hemisphere over the last 2,000 years