Escaped methane likely warms the climate as much as all natural gas burned in the U.S.
Interplay between forests and the atmosphere leads to surprising relationships between distant regions.
Scientists discuss the risks and feasibility of using solar geoengineering to cool us off.
An exceptionally strong El Niño may have caused 1876-1878 famine that killed tens of millions.
People who eat fish from glacial meltwater may be at risk from persistent organic pollutants produced in the 20th century.