1. The World Climate Research Program Research Strategy and Priorities: Next Decade.- 2. Challenges of a Sustained Climate Observing System.- 3. On the Reprocessing and Reanalysis of Observations For Climate.- 4. Climate Processes: Clouds, Aerosols and Dynamics.- 5. Aerosol Cloud-Mediated Radiative Forcing: Highly Uncertain and Opposite Effects From Shallow and Deep Clouds.- 6. Improving Understanding of the Global Hydrologic Cycle.- 7. Land Cover and Land Use Changes and Their Impacts on Hydroclimate, Ecosystems and Society.- 8. Prediction From Weeks To Decades.- 9. Assessing the Reliability of Climate Models, CMIP5.- 10. Changes In Variability Associated With Climate Change.- 11. Understanding and Predicting Climate Variability and Change at Regional Scales.- 12. Attribution of Weather and Climate-Related Extreme Events.- 13. Challenges in Estimating and Understanding Recent Changes in the Frequency and Intensity of Extreme Climate and Weather Events.- 14. Carbon Dioxide and Climate: Perspectives on a Scientific Assessment.- 15. Atmospheric Composition, Irreversible Climate Change, and Mitigation Policy.- 16. Building Adaptive Capacity To Climate Change in Less Developed Countries.- 17. A Climate and Health Partnership to Inform the Prevention and Control of Meningococcal Meningitis in Sub-Saharan Africa: The MERIT Initiative.