Comment Re:Link to paper (Score 1) 76
The year is 1992. You are an undergrad in physical science at a pretty good school (but certainly not Ivy league). In a freshmen chemistry class final, you use wild extrapolation from a small data set to make significant extrapolation of the x-axis. Your professor gives heavy sigh, and gives out yet-another F. You go on to become a climate scientist and continue to do this because you never understood why it is bad. Your now dead professor can only roll over in his grave.
A number of the PM 2.5 studies I've seen do exactly this. They gather air quality data and run the figures based on preexisting models of health impacts to entire populations or even the entire planet and surprise out comes insane figures.
I just want to know how they came to radically different figures in a later revision of the same work. This is well outside the range of the CI in the version published in nature.