(I believe this not because I've studied arguments and counterarguments, but because this is the claim that several public "global warming skeptics" have changed their minds to believe; there's a good bit of diversity among people who think AGW exists.)

Warning, "there should be" statement ahead: How good a measure of truth do we think this method provides? There should be a source that analyzes what (and what type) of minds have been changed to and from positions on all Big Issues, the diversity of types of minds on each side, stratification of contrarian and meta-contrarian positions. Perhaps Take On It could or already does serve in this capacity? Is there something to this; a meta-memetic analysis of widely held beliefs?