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  ericc

  April 21, 2007, 2:02 p.m.

  In addition to solar variation, it is believed that global warming is very likely due to the increase in anthropogenic greenhouse gas concentrations and other natural phenomena such as volcanic eruptions.

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  KingOfTruth

  April 22, 2007, 4:08 a.m.

  Actually those have very little effect.....it is mostly the suns many radiations and light along with the various orbits and wobbles of the earth and moon that cause the rest.....even volcanoes and earthquakes....and CO2 increases always follow temperature increases.....

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  RickyDawkins

  May 13, 2007, 1:51 a.m.

  The role of the Sun over longer epochs remains an area of active research.) Three hypotheses have been advanced for solar driving of the current rapid temperature rise. One hypothesis speculates that there is a small but persistent rise in the solar flux at the minimum phase of solar sunspot activity, when the small periodic increase in flux due to this activity is absent. So far, measurements from space lack the accuracy to establish the precise value, but they do put an upper limit on any possible increase, which is far too small to explain the observed terrestrial temperature rise. In addition, there are other solar observers who infer from other sensitive data that there is no secular increase in this flux at all, over the last three decades of measurements (Hudson 2004).

  http://www.cfidc.org/opp/jordan.html

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