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Project	Tucson Audubon bird habitat Habitat for Humanity solar panels
Total Credits Cost

How the calculator works
We multiply the number of miles you’ve traveled by the amount of CO2 your mode of transportation makes per mile. For a mid-sized car that averages 25mpg, for example, every mile on the road creates 0.78 lbs (0.000355 metric tons) of CO2 in the atmosphere. Because airplanes contribute most of their CO2 on takeoffs, shorter flights produce an average of more CO2 per mile flown. That’s why you choose between short hops, cross country trips and long hauls on our calculator.

The cost of your credit
When you buy one Neutralizing or Regeneration Credit from The Local Trust, we pledge to take at least one ton of CO2 out of the atmosphere for you. The price includes the cost of the trees we plant, the solar panels we install and the administrative activities that keep us going. Only 10 percent of your charge goes to administrative fees – 90 percent goes to the project you choose.

Sources:

• www.eia.doe.gov/oiaf/1605/excel/Fuel Emission Factors.xls
• www.ghgprotocol.org/
• 1999 Special Report on Aviation in the Global Atmosphere, the Intergovernmental Panel on Climate Change (IPCC)
• Climate Neutral Network
• Mohamed A. Fadl, Steven Gronski, Henry Asah, Alan Tipton, Timothy E. Fulbright and Peter Felker. 1989. Regression Equations to Predict Fresh Weight and Three grades of Lumber from Large Mesquite (Prosopis glandulosa var. glandulosa) in Texas. Forest Ecology and Management, 26. pp. 275-284. Elsevier Science Publishers B.V., Amsterdam.
• Gregory McPherson, James Simpson, Paula Peper, Scott Maco, Quigfu Xiao, Ed Mulrean. 2004. Desert Southwest Community Tree Guide: Benefits, Costs and Strategic Planning. AZ State Land Department Natural Resources Division, Urban and Community Forestry Section and Arizona Community Tree Council.
• Dieter Geesing, Peter Felker and Ralph L. Bingham. 2000. Influence of mesquite (Prosopis glandulosa) on soil nitrogen and carbon development: Implications for global carbon sequestration. Journal of Arid Environments 46: 157–180.