This course provides a quantitative introduction to the Global Climate system and Climate modeling, which attempts to understand and predict climate changes. It briefly describes the physical process in Climate system, IPCC and CMIP5 climate projections. It also provides exposition of climate scenarios and their uncertainties, besides providing deep insights into cryosphere-climate interactions. The monsoon phenomenon is used as a primary example of natural climate variation for which predictions with climate models are now possible. Regional climate change projections over South Asia are also a highlight of the course. The course also provides hands-on post processing and visualization of climate model data.