The first pie chart illustrates the proportion of total energy used in a typical Australian home on various types of appliances, while the second chart gives a breakdown of the relative amounts of greenhouse emissions produced as a result of using them.
From the charts, it is apparent that the percentage of total greenhouse gas emissions created by a particular category of appliance does not necessarily reflect the proportion of energy used by that category.
Household heating systems use the highest amount of energy in an average Australian dwelling (42% of the total). Remarkably, however, this only accounts for 15% of the home’s greenhouse gases emissions resulting from its total energy usage. Water heating constitutes the second highest usage amount at 30%, and this produces an almost equal proportion of emissions (32%).
In contrast, the other types of appliances, while collectively utilising only 28% of the total energy consumed in a household, each contributed more towards greenhouse emissions relative to their individual usage proportions: refrigeration used 7% of the energy but accounted for 14% of the emissions; lighting, 4% of the usage and 8% of the emissions; cooling, 2% usage and 3% emissions; other appliances, 15% usage and 28% emissions.