What is Climate model?
[[File:Global_Climate_Model.png|right|thumb|350x350px|Climate models are systems of [[differential equation]]s based on the basic laws of [[physics]], [[Fluid dynamics|fluid motion]], and [[chemistry]]. To “run” a model, scientists divide the planet into a 3-dimensional grid, apply the basic equations, and evaluate the results. Atmospheric models calculate [[wind]]s, [[heat transfer]], [[radiation]], [[Humidity|relative humidity]], and surface [[hydrology]] within each grid and evaluate interactions with neighboring points.]] '''Climate models''' are [[mathematical model]]s that are used to study [[climate]] on a [[planet]], and how it changes over time. Climate modelling is very complex, and [[Numerical analysis|numerical methods]] are used, most of the time. Climate models look at how different things, such as the [[Atmosphere of Earth|atmosphere]], [[ocean]]s, [[Terrain|land surface]] and [[Cryosphere|ice]] interact. Climate models are used for different things, such as looking at how the climate in one spot on the earth will be, in the future. Climate models may also be qualitative (i.e. not numerical) models and also narratives, largely descriptive, of possible futures.<ref>{{Cite journal|last=IPCC|year=2014|title=AR5 Synthesis Report - Climate Change 2014. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change|url=https://www.ipcc.ch/site/assets/uploads/2018/02/SYR_AR5_FINAL_full.pdf#page=74|page=58|quote=Box 2.3. ‘Models’ are typically numerical simulations of real-world systems, calibrated and validated using observations from experiments or analogies, and then run using input data representing future climate. Models can also include largely descriptive narratives of possible futures, such as those used in scenario construction. Quantitative and descriptive models are often used together.}}</ref> Quantitative climate models take account of incoming [[energy]] from the sun as short wave [[electromagnetic radiation]], chiefly [[Visi