Abstract
Since the start of industrialization of our Earth (i.e. for aboutthe last 150 years), the use of fossil energy has created a new(additional) source of carbon dioxide emissions from the Earthinto the atmosphere. Though these emissions are small comparedwith the natural emissions (mainly from the biosphere), they havedisturbed the carbon balance of the atmosphere, i.e. the carbondioxide concentration of the lower atmosphere has increased froma rather stable pre-industrial level (280 ppm) to a present levelof 360 ppm. Besides carbon dioxide, the concentration of other‘greenhouse gases’ has increased through mankind’s activities. Themost important of these increases are for methane, which rose froma pre-industrial value of 0
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