Atmospheric scientists predict significant global climate changes as a result of increasing levels of greenhouse gases in the atmosphere. The consequences of such changes in the energy budget of the atmosphere on regionally-specific climate changes is difficult to predict.
The scenario presented is a plausible future climate for the Australian region, made solely for the purpose of examining the type and magnitude of likely impacts of such changes. While the predicted changes in the gross features of global change are regarded as highly probable, the regional changes suggested in this scenario are most speculative. The scenario deals only with the primary factors of climate such as temperature, rainfall, etc. No attempt is made to predict regional changes in secondary climate factors such as evaporation, soil moisture, etc., where the interaction of two or more primary factors is involved.
Predicting sea level rises is equally difficult. It is assumed that future rises will be in proportion to temperature changes with the proportionally based on previously observed changes. These rises are thought to be due to thermal expansion of sea water and possibly also to partial melting of mountain glaciers and the fringes of the high-latitude ice caps.