Earth's climate has changed several times during its geological history with alternate glacial and interglacial phases. However, since industrial revolution and urbanisation have picked up, the rate of GreenHouse Gas (GHG) build-up in the earth's atmosphere has gone up steeply resulting in increased temperature of the earth's surface, commonly known as global warming or climate change.
Climate models at the global and regional scale (General and Regional Circulation Models) are used to study and simulate the variations in climate because of the human-induced perturbations. The trends in the climate, as brought out in the Fourth Assessment Report of the IPCC (Intergovernmental Panel on Climate Change), show that the total temperature increase from 1850
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