You can make pie charts in the Envirometer, by selecting a single bar in an envirometer-graph. The Envirometer will show you a pie charts of the year. The pie chart shows which part (in %) an environmental theme has in the total environmental impact.
You can create pie charts for both the Environmental burden, CO2-meter and costs-graph. The first year that you fill in the Envirometer a pie chart often says more than a bar, because the relationship between environmental issues is more clearly visible.
You can create a pie chart per environmental theme by clicking on one of pieces in the pie chart.