Index value plots use index values instead of absolute numbers. For example, they would be useful to predict a trend past the point of completion for a particular study, using an average from the time period of the study then comparing the actuality of continuing events to the predicted behavior of the graph. These index value plots have done just that with the standard deviations of emissions of ozone-depleting substances and greenhouse gases between 1970 and 2010 (when the study was done) and then projected the standard deviations into the future up to 2090.
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