The solar activity-theory have been discarded in most scientific data, as they seem to have little effect. There have been an increase in solar activity the last years, but this seems to be unrelated to the increased global warming. There are, as we all know, extreme solar activity right now, giving displays of norther light in many regions of the world, but this has so far not effected the wetather in any way. In fact, solar winds may often "blow away" some of the galactic dust that are known to influence the climate.
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