A somewhat more interesting metric is the amount of greenhouse gases emitted per capita of gross domestic product (GDP). (scientificamerican.com)
Looking at the integrated bottom line, as you call it, can produce interesting metrics, but are they metrics that are going to keep you afloat ten years from now? (treehugger.com)
Use an email analytics tool such as EmailAnalytics to find out exactly how much time you spend on email, as well as how many words are in an average email you send, what days of the week you send and receive emails most, and a bunch of other interesting metrics. (inc.com)