Tunguska and global warming?

ScienceDaily: Greenhouse Theory Smashed By Biggest Stone; Is Global-warming Down To Humanity? Or Are Other Factors At Work?

See the link above for a tentative idea from a Russian scientist about the possible connection between the rather large meteorite hit that was the Tunguska event in 1908 and global warming.

Many loopy ideas come out of Russian science, but if you read the arxiv link to the preprint of his paper, this guy does not sound too bad. Still, somehow I expect that they will be scientists rushing to argue against this.

UPDATE: over at Real Climate, they explain why they think there is nothing much to this idea.