I had attempted a similar project
at the 3rd conference with my poster «Comparison of Climate
Forecasts: Expert Opinions vs. Prediction Markets» in which my abstract proposed the following: «As an experiment, we will ask participants to go on the record with estimates of probability that the global temperature
anomaly for calendar year 2012 will be equal to or greater than x, where x ranges in increments of 0.05 °C from 0.30 to 1.10 °C (relative to the 1951 - 1980 base period, and published by NASA GISS).»
It is that we should have known
at every point if any accuracy was being lost as complexity was gained on what you characterised yesterday as the «cost driver» or «actionable
forecast» (rightly or wrongly) of globally averaged temperature
anomaly.