this increase of Green House Gasesconcentration is also known as "Infrared Flux" at the tropopause (Wang). The modelsused to predict this information can also closely mimic the other layers of the atmosphereas well as the surface. Worldwide temperature measurements are carefully taken withmany variables in mind. Such variables would be urbanization of a region, aerosols,precipitation, and changes in temperature and clouds (Hansen). Usually the temperature isthe first variable that is considered when assessments of the world climate change aretaken, it is also very important to consider other data that is part of the climate systemalong the line of time and space. Some other sources of information are: tree rings, borehole temperature measurements in the soil, permafrost, and ice sheets, and measurementsof the mass of valley glaciers and ice caps. By looking at this material for the past 600years it has been determined that the warming in the twentieth century is greater over thistime period (Briffa).From paleoclimate studies it has been concluded that the Earth's climate has beenaltered by more than just Green House Gases, but Inorder to find the effects of the GreenHouse Gases specifically, a study of records from the periods when the changes in theatmospheric carbon dioxide were much larger than those of our century. Large naturalvariation in the atmosphere's carbon dioxide were found in the observation and analysis ofgas bubbles trapped in glacier ice cores, are correlated with glacial (ice age) andinterglacial climate change of the latest Pleistocene and Holocene epochs. These glacialperiods are associated with low carbon dioxide concentrations, and the interglacial periodswith high concentrations. When looking at methane concentrations within these cores,there was a similar correlation (Chappellaz).Some of the predicted changes to the Earth's climate due to this continual rise inGreen House Gases are: increase in mean sur...
