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"Oxygen levels fell significantly in deep-sea areas of the Gulf of Mexico contaminated by oil plumes from the BP spill. But although researchers found a 20% decline in dissolved oxygen, the drop was not steep enough to create biological 'dead zones' that some scientists feared might form in the wake of the BP disaster." Those were the findings of a government study.

"New oil and gas drilling is probably the most visible activity people associate with threats to groundwater in Texas. But it's not usually the source of known contamination, according to state records. Instead, old or abandoned oil and gas wells, petroleum storage facilities and even existing water wells are most frequently identified as problems."

"The United States ended its involvement in the Vietnam War 35 years ago, and established diplomatic relations with Hanoi 15 years ago.  But a recent visit to Vietnam by members of the U.S.-Vietnam Dialogue Group on Agent Orange and Dioxin saw the lingering effects of highly toxic chemicals used by U.S. forces to remove dense vegetation in a bid to flush out enemy combatants."

"SMELTERVILLE, Idaho -- They call themselves 'the leaded.' They grew up in the shadow of a giant lead smelter here, and were contaminated with some of the biggest lead releases in the nation's history."