The evidence is not "anecdotal". The compilation is of peer-reviewed research studies published in scientific journals.
"Rosenzweig, based in New York, and colleagues around the world analyzed some 80 studies that document changing aspects of natural processes: when gingko trees bloom in Japan, how much glaciers melt in the Alps, when frogs start their springtime calls in New York and so on. Each study offered at least 20 years of data collected between 1970 and 2004. In all, the mountain of data comprised around 29,500 data series that each revealed a significant change. (Twenty years of melt measurements from two separate glaciers counted as two data series.)"
Am I missing something? They talk about all the studies and showing it to be warmer, and Ginko trees blooming earlier. Great, its warmer. But then in mid-paragraph they say something to the effect of “proof that it is caused by man.”
I can grant them “proof that it is warmer in that area”. But where is the proof that it is manmade?