Tree Rings Show Unprecedented Rise in Extreme Weather in South America
A new South American Drought Atlas reveals that unprecedented widespread, intense droughts and unusually wet periods have been on the rise since the mid-20th century.
Climate-Driven Megadrought Is Emerging in Western U.S., Says Study
Scientists say a long-feared megadrought, worse than anything in recorded history, seems to be starting up in southwestern North America.
Climate Change Could Revive Medieval Megadroughts in U.S. Southwest
New research by Columbia scientists examines the factors that caused severe, long-lasting droughts in the Southwest and suggests climate change may bring a new round of megadroughts.
Drought: A Wide-Angle Picture
A new book, the second in a series of primers with the Earth Institute imprint, provides an interdisciplinary overview of drought, bringing together many fields including climate science, hydrology, and ecology.
Climate Change Has Made Western Megadrought 38 Percent More Severe, Say New Estimates
The current megadrought in the American West may be one of the most severe in the past 1200 years—and research by Columbia bioclimatologist Park Williams found climate change is partially to blame.