Of importance and closely connected to the environmental pressure from the economy is also the energy system infrastructure, i.e. how electricity and heat are generated, and the use of fossil fuels. The analytical starting point is the national accounts - where we find the basis for calculating the macroeconomic indicator, GDP. The description of the economy needs to be "opened up" so that the structure of production and consumption can be seen, since the environmental pressure is very different depending on the type of economic activity analysed.