What? Of course we should! It is of course partially caused by humanity. But it’s a common debate among researchers exactly how much the trends are affecting the changes.
I wonder how Much of it is global warming vs other effects! Would be nice to see a even longer historical overlay of the changes. Or even have the values corrected for anomalies that are not an effect of human involvement.
I love last.fm, always have been. Started out using the winamp plugin in 2007. I even synced my ipod regularly through itunes & the scrobbler to get stats.