Long Postscript: I am working on a powerpoint presentation for next
week on anthropogenic global warming, but here are two charts from that presentation that get at the «we can't think of anything other than man that might be causing late 20th century warming.»
The required activity for that
week involved reading the peer - reviewed paper authored by the Skeptical Science team, Quantifying the Consensus
on Anthropogenic Global Warming in the Scientific Literature.