Eigil Friis-Christensen and Henrik Svensmark

Solar-Terrestrial Physics Division, Danish Meteorological Institute, lyngbyvej 100, DK-2100 Copenhagen Ø, Denmark, E-mail: Eigil.Friis@dmi.dk

ABSTRACT

The Earth’s climate has always been changing. This is documented in historical as well as in geological records. The reasons for these changes, however, have always been subject to discussions and are still not well understood. In addition to natural climate changes the risk of human influence on climate has recently been seriously considered by the Intergovernmental Panel on Climate Change. Any factor that alters the radiation received from the Sun or lost to Space will affect climate...