Remember the idiots who said that fluctuations in the sun's output level aren't responsible for global warming? Does this mean they were wrong?
All the studies I've seen show that the Sun's heat and light output has not varied +-1.5% over millions of years. The major variable is the Sun's powerful magnetic field. When there are lot's of sunspots, the Sun's magnetic field envelops the Earth and blocks cosmic rays and causing much clearer skies. When more Cosmic rays hit the Earth they cause much more cloud formation which cools the planet.