The pie charts below show units of electricity production by fuel source in Australia and France in 1980 and 2000.


The first pie chart compares the power consumption in a typical house whereas the second one presents data on the percentages of greenhouse effects of these power-consuming equipment in a European country. As a general trend, the more energy a household appliance use, the more greenhouse gas it emits.
The first pie chart illustrates the average energy usage in a typical family in a European country while the second pie chart shows the percentage of greenhouse gas emissions from this energy consumption.