In stationary combustion, gas, heating oils and kerosene are forms of energy sources emitting CO 2 . These emissions fluctuate with temperature variations. The colder the weather, the more heating is needed. If sufficient hydroelectricity is not available, the burning of fossil fuels will increase. Water vapour and CO 2 are the major natural greenhouse gases of the atmosphere.
Water vapour is the most important green house gas.
This gives a general increase of over 27 per cent since preindustrial times. Per capita this is rather high, just above 9 tonnes of CO 2 . Global average is approximately 3.9 tonnes per capita. In 1989 the CO 2 emissions per capita in Norway were 8,3 tonnes, which is the Norwegian aim for the year 2000. Burning of wood is not considered as contributing to the greenhouse effect, since the energy released is assumed to be balanced by new tree growth.