OH Lubos Motl, the string theorist at harvard?
Motl keeps a blog mainly about string theory but also discussing general science, politics and events at Harvard. In science, besides talking about string theory, he frequently criticizes what he thinks is alarmism about global warming. In politics, he was one of few Harvard faculty willing to openly defend president Lawrence Summers's controversial remarks regarding women in science.
granted this is from Wikipedia....
http://en.wikipedia.org/wiki/Lubos_Motl
the quote, philip, is his opinion. in fact overwhelming evidence proves the opposite, that it is almost perfectly correlated. that temp lags greenhouse gas. on top of that more and more evidence continue to confirm that temp lags CO2....
as far as percentage that is man made. somewhere right now around 7-9% if i remember correctly