1. Carbon Calculators Group 2

2. The Calculators We Chose Environmental Protection Agency Berkeley CoolClimate Nature Conservancy These calculators seemed to be the most in- depth and represented different types of organizations (a government agency, university, and an environmental organization)

3. Differences in Criteria The Berkeley CoolClimate calculator seems to give us the largest carbon footprint. Motivations: expand knowledge and awareness of sources of carbon emissions Target population: Academics, intellectuals, persons seeking to gain further information about the environmental problem

4. Differences in Criteria The E.P.A., surprisingly, seemed to give us the smallest footprint of all the calculators. Motivations: government institution, neutrality, mobilize others to support the E.P.A., provide simple/easy/cheap ways to reduce their carbon footprint Target Population: persons/businesses seriously seeking to gain real information about their carbon footprint and practical ways on how to lower it.

5. Differences in Criteria The Nature Conservancy was the most user- friendly out of all of the calculators. Motivations: increase awareness of the environmental problem among people who have not necessarily been exposed to such information, easy-to-use, self-promotion Target Population: everyday people, people relatively new to the environmental movement, younger people

6. Criteria Commonalities All of the calculators took into consideration:  The state/region you lived  Car mileage / # of miles driven  People in household

7. Trade-offs Some calculators show the impact of changes when the user modifies behavior, which allow people to alter their behavior based on the results. Some calculators generalize for ease of use, but sacrifice specificity and accuracy, for example, the Nature Conservancy.

8. Conclusions Designers need to keep in mind that there are lots of calculators already out there; need to consider your specific audience and their needs  Can’t design one ‘perfect’/stable calculator Making it clear how many variables are present in these calculations would be helpful  None of the calculators said how accurate they were; implied high accuracy even if it was impossible based on given data Stable Technology? Based on trade-off options and different criteria, no