2011 CCWG Workshop Presentations Stratospheric sulfate geoengineering has limited efficacy and increases tropospheric sulfate burdens Jason English Methane Lifetime in CMIP5 simulations Arlene Fiore Biogenic VOC Emissions in CESM Colette Heald AC&C Hindcasts: The Emerging Format Peter Hess CCWG J.-F. Lamarque, NCAR-CGD GEOMIP using CESM1-CAM4 Simone Tilmes, NCAR-CGD