[url=http://news.nationalgeographic.com/news/2007/02/070228-mars-warming.html]Simultaneous warming on Earth and Mars suggests that our planet's recent climate changes have a natural—and not a human-induced—cause, according to one scientist's controversial theory.[/url]
It is almost certain that Bush's Republicans and industrialists everywhere alike will pounce on this, citing it as though it was ironclad fact (a.k.a. "sound science") and wielding it as a cudgel to silence their critics, despite much unresolved controversy.
It would, I think, be wise to await further confirming or disconfirming studies of solar irradiance to be conducted, especially since AGW is such a contentious, even heatedly emotional, issue.
I fully agree with you, but even if global warming is not solely caused by human activities I don’t think it’s a bad idea to seriously start looking for alternative energy sources in any case.