Dr. David Fahey will be presenting the 2017 National Climate Assessment. David is the Director of the Chemical Sciences Division in NOAA’s Earth System Research Laboratory in Boulder, Colorado, USA. The Division’s mission is to advance scientific understanding of climate change, air quality and stratospheric ozone through research on the chemical and physical processes that affect Earth’s atmospheric composition. He serves the Montreal Protocol as a Co-Chair of its Scientific Assessment Panel on stratospheric ozone depletion. He has authored major assessments on the topics of black carbon and aviation to address their roles in the climate system.