Climate change is a global phenomenon, affecting weather events around the world.

In October 2003, a little-known think tank in the Department of Defense quietly released a report warning that climate change could happen so suddenly it could pose a major threat to our country's national security. Why was the Pentagon worried about abrupt climate change? Because new evidence from Greenland showed it had happened before. 

The WestMap climate analysis and mapping toolbox is an interactive, web-based tool that helps users see the climate conditions that underlie droughts, storms, floods, and changes in streamflow.

The U.S. Drought Portal offers access to maps, data, and expert assessments through easy-to-use tools designed to help decision makers monitor, plan for, and recover from water shortages.

flooded houses on Breezy Point following Hurricane Sandy

Understanding how extreme events in 2012 were influenced—or not—by human-caused climate change

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