When we take a gander at enduring atmosphere information (e.g. prepared records of regular estimations on specific variables, for example air temperature and precipitation over say 100 to 300 years), we uncover that atmosphere is not steady however does indeed change. Additionally, provided that we take a gander at various types of aberrant proof (e.g. prove from ice sheets, topography) about the course of atmosphere over say the last 5 to 10 centuries (i.e. 5,000 to 10,000 years), we run across that variety in atmosphere in the past has been extremely tragic for sure, including cycles of major ice ages and warming periods.