What happened? Simple. The data and/or methodology that was used to calculate the huge increase was incorrect.
Steve McIntyre finally got hold of the raw tree-ring data that was used in the now famous hockey stick graph. He claims that they cherry-picked data to support the conclusions they wanted.
He has recently got hold of the raw data (after a decade of trying) and has rerun the data and generated a graph that seems to predict the climate of the past couple of decades correctly (R source code included).
Steve McIntyre finally got hold of the raw tree-ring data that was used in the now famous hockey stick graph. He claims that they cherry-picked data to support the conclusions they wanted.
He has recently got hold of the raw data (after a decade of trying) and has rerun the data and generated a graph that seems to predict the climate of the past couple of decades correctly (R source code included).
http://www.climateaudit.org/?p=7168