Changes in the global climate system are unmistakable, as is now evident from observations of increased global average air and ocean temperatures, decreased historical snow pack, rising global average sea level, and more frequent severe weather events. 1 The U.S. Department of Energy (DOE) recognizes that changes in the global climate system could have a profound impact on the Department’s mission activities. DOE is committed to reducing greenhouse gas (GHG) emissions and mitigating climate change by developing clean energy and energy efficiency technologies for commercial deployment while providing leadership through its own sustainable operations. As effects of climate change are felt across the world, it is necessary to characterize potential impacts on the DOE mission, programs, and operations to foster adaptation and resilience. DOE will identify where to focus resources to develop greater resilience over time, minimize potential risks and maximize potential opportunities created by climate change. It is important to note that while longer term damages could be very substantial, we may have more modest, nearer term impacts (above and beyond those that we already have due to weather vulnerabilities). The 2014 DOE Climate Change Adaptation Plan (Adaptation Plan) outlines Departmental vulnerabilities and serves to guide our response to allow DOE to continue to achieve its mission.