Global Warming Footprint Calculator
(Copyright 2007 by Center for Sustainable Organizations)

Background: This Global Warming Footprint calculator is a specialized application of the Social Footprint Method designed to measure and report the sustainability of an organization’s CO2 emissions. It measures and reports emissions over time against levels specified in a climate change mitigation plan known as the WRE350 scenario. The WRE350 scenario aims for stabilization of CO2 concentrations in the earth’s atmosphere to a safe level of 350 parts per million (ppm) by 2150. The baseline year of the scenario is 2000.

Instructions: Enter data in the yellow cells for as many consecutive years as possible, starting with 2000. Data for 2000 must be included! There must be no gaps in data for the range of years entered, such as entering data for years 2000–2005, but not for 2003. Always press “Update” to get final scores.

Note 1: Enter total annual hours worked by all employees.
Note 2: Enter as either carbon or CO2, but not both. Use consistent metrics.
Note 3: Report carbon offsets for years impacted, not purchased, unless the same. Offsets in 2000, if any, must be less than Annual Emissions!
Note 4: <1 = Sustainable; >1 = Unsustainable.

Scores: There are two kinds of scores reported. The first is an annual score (weighted by workforce size), which reports emissions performance against allowable emissions standards specified in the WRE350 plan. The second is a cumulative score, which reports performance against the same WRE350 plan on an inception to date basis. The most recent cumulative score shown is the best indicator of organizational performance, since it reflects overall performance to date across multiple years.

See presentation for background on this method. For more information, contact Mark W. McElroy. And please give us your feedback!

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