Q&O has a nice roundup on the science around the Sun and the Sun's well documented increase in intensity and its potential affect on global warming. As I have mentioned before, there is a growing body of evidence that some warming has to be laid at the Sun's doorstep.
The best measurements of global air temperatures come from American
weather satellites, and they show wobbles but no overall change since
That levelling off is just what is expected by the chief
rival hypothesis, which says that the sun drives climate changes more
emphatically than greenhouse gases do. After becoming much more active
during the 20th century, the sun now stands at a high but roughly level
state of activity. Solar physicists warn of possible global cooling,
should the sun revert to the lazier mood it was in during the Little
Ice Age 300 years ago.
Climate history and related archeology
give solid support to the solar hypothesis. The 20th-century episode,
or Modern Warming, was just the latest in a long string of similar
events produced by a hyperactive sun, of which the last was the
There is a lot more. I am not ready to say, though, that the substantial increases we have seen in atmospheric CO2 levels are not also having an impact. That impact is just a lot less than warming-panic-spreaders like Al Gore would like to acknowledge After all, it is much easier to demagogue your way through an election beating up Exxon and GM than by beating up the Sun. And, after failing to take over the economy under the banner of socialism, statists want to use global warming to take a second shot at world domination.