News
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The way companies do it is a lot of napkin math. I worked next to a team that built a service to help other companies figure this out (I provided the sample code and docs they share with customers for onboarding). You plug in some basic info, as an example this building used X kilowatt hours of electricity that the power company says is 10% coal and 90% hydro, which, based on a lookup table that means Y tons of CO2 emissions per hour, add X*Y to your total and move onto the next building. It’s not an exact science measuring actual emissions, more looking for ballpark numbers trying to get rough estimates based on what sustainability consortiums agree is the emission rates for certain things/activities/events. It doesn’t matter if your X is slightly more efficient than your neighbors X, because your maintenance guy is better, both will get the “X” rate for emissions based on the agreed upon value for the thing being measured. The idea is to capture as many things/activities/events as possible to get an estimate of emissions, not a measurement.