This lecture covers the concepts of adaptation to climate change, including the difference between mitigation and adaptation, downscaling for adaptation modeling, and the economic aspects of climate change adaptation. It also discusses the need for research on adaptation, the definition of adaptation, and the types of adaptation such as endogenous and exogenous adaptation. The lecture explores adaptation as a public good, providers of adaptation, and domains of adaptation in both public and private sectors. Additionally, it delves into anticipatory versus reactive adaptation in natural systems, and sector-specific adaptation strategies for agriculture, water, sea level rise, energy, health, ecosystems, biodiversity, forestry, and more.