Excellent interview with Fred Singer

Here.

A key excerpt:

Q: When you say global warming is natural, what is your chief culprit?

A: The sun. The sun. Definitely. The evidence we have shows an extremely strong correlation with solar activity. The (Earth's) temperature follows the solar activity and the correlation is very strong. The mechanism itself is still under some dispute, but we think in some way the sun influences cosmic rays, which in turn influences cloudiness.

Q: That doesn't even count the heat output of the sun, which changes over time, doesn't it?

A: Those are very small and are not enough to account for all the climate changes that we see. What is causing it is not just the heat of the sun, but emissions from the sun that we don't see -- except with satellites and spacecraft -- the so-called solar winds and magnetic fields.

Q: What about the things like the wobble of the Earth on its axis and the Earth's eccentric orbit around the Sun?

A: That's also important, but on a different time scale. For each time scale there is a particular cause. The time scale I'm talking about when I talk about direct solar influences are of the order of decades. The time scales that involve wobbles and orbits of the Earth around the sun involve times scales of 10,000 or 100,000 years.