text: "In the absence of a convincing explanation for warming since the mid 19th century, as well as the multi-decade hiatus periods, I find the extremely likely confidence level to be logically insupportable." "JC message to Gavin Schmidt (as per our discussion on Dan Kahans blog): No I am not making things up re the 50-50 attribution argument. I regard it as a fundamental flaw in logic to infer high confidence in attribution since 1950, without understanding the warming in the early part of the 20th century and the mid century hiatus."