Not through complicated trading software or
lagging indicator based trading methods, but through a discretionary market perspective that was developed through an awareness of price dynamics and market conditions in the
various markets they traded.
So you answer that «the climate system is profoundly complex with
various feedbacks and time
lags that come into play, and can not be explained in term's of someone's simplistic expectations,» as an answer on the question why «this melting really was an
indicator of Anthropogenic Global Warming»?