During the last decade many local governments have launched initiatives to reduce CO2 emissions and the potential impact of hydro climatic disasters. Nonetheless, today barely 11% of subtropical and tropical cities with over 100,000 inhabitants has a climate plan. Often this tool neither issues from an analysis of either climate change or hydro climatic risks, nor does it provide an adequate depth of detail for the identified measures (cost, funding mode, implementation), nor a sound monitoring-evaluation device. This book contributes to improve the quality of climate planning by providing 19 examples of analysis and assessments in eleven countries. It is intended for local operators in the fields of climate, hydro climatic risks, physical planning, besides researchers and students of these subjects. The first chapter describes the status of climate planning in large subtropical and tropical cities. The following six chapters discuss the hazards (atmospheric drought, intense precipitations, sea level rise, sea water intrusion) and early warning systems in various contexts. Nine chapters enlarge on flood risk analysis and preliminary mapping, climate change vulnerability, comparing contingency plans in various scales and presenting experiences centred on adaptation planning. The last three chapters introduce some best practices of weather and climate change monitoring, of flood risk mapping and assessment