A new study estimates that the Gulf of Mexico marine dead zone could last for decades, due to lingering agricultural fertilizer runoff.

Arsenic contamination of groundwater may affect up to one-fourth of Pakistan's population.

AAAS Symposium Sheds Light on Potential Disasters—and Remedies The Mekong River courses over some 2,700 miles of dramatically changing terrain, traverses six Southeast Asian countries from China’s Tibetan Plateau to the South China Sea, supports one of the planet’s most productive inland fisheries and continues to reshape a region it has defined for thousands of years.

Scientists have recovered the first ancient human DNA from cave sediments lacking human skeletal remains.