People who eat fish from glacial meltwater may be at risk from persistent organic pollutants produced in the 20th century.
Sediment core from a Copenhagen lake tells the story of the Industrial Revolution.
Hundreds of U.S. streams may have significant levels of endocrine-disrupting chemicals from treated wastewater.
Wetlands can form in overlooked spaces, and that might be a good thing.
NASA prepares to replace the twin satellites, named GRACE, that have monitored Earth's droughts, glacial retreats and sea level rise for the last 15 years.