Global warming from the influence of man is clearly seen and fairly reliably predicted. The additional influence of solar radiation variations is less certain, at least according to the link below, which looks more sensible than the numerous flaky "myth-busting" web sites I just scanned.

I think the point might be that solar radiation can and will fluctuate, but has determined only 20% of the changes in temperature over the last 250 years, and global warming by man will only accelerate with the accumulating and accelerating effects mankind is generating.

• newscientist link