The greenhouse gases carbon dioxide, methane, chlorfluorcarbons and nitrous  oxide are increasing due to man's activities. 0n physical grounds it is generally believed that this will influence the climate of the earth. Observational evidence, mainly global mean temperatures, indicate that the earth becomes warmer at present. It is, however, not possible to rule out that natura! factors have caused observed changes until now. Swedish data show small or no trends at present.

The suggested scenarios for Sweden are given in interval form to express the large uncertainty. For temperature and precipitation in the years around 2030 we suggest the following changes compared with the levels around 1990.

                 Winter   Summer Winter     Summer.            

                 temp.    temp.     Prec.       Prec.

Northern

Sweden:    0.5-1.5  00-1.5     0-15 %   0-10 %

Southern

Sweden:    0.0-1.0  0.0-0.5    0-15 %   0-10 %