No doubt the sun has its effects on the Earth's climate - and there isn't much we can do about that. However - just look at a graph of world population: there is your effect on our global climate. Or, as I just saw a few days ago: a 'screenshot' of airplanes in flight on a given day over the US: there is your effect on climate. Or take the eight lanes full with traffic in LA - or in Chinese cities, or elsewhere... anthropogenic CO2 wherever you look. Just wait until the oceanic Methane Hydrate deposits disintegrate due to rising sea water temperatures. If this is not a run-away system...