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Table 8: Summary & Ratings Of All 13 Companies

Company	Calculator accuracy	Standards & Verification	Project Location	Project Type	Price per ton of CO2 offset	For or non-profit	Overall Recommendation
atmosfair	Excellent	CDM, Gold Standard	International	Renewable, Energy Efficiency	$17.30	Non	Yes
climate friendly	Excellent	Green Power, Gold Standard	International, Domestic	Renewable	$14.50	For	Yes
Myclimate	Very good (Swiss site); Acceptable but emissions likely underestimated (US site)	Gold Standard	International	Renewable, Energy Efficiency	$18.00 (US site) $27.40 (CH site)	Non	Yes
NativeEnergy	Very good	Green-e, Climate Neutral Network	Domestic	Renewable	$12.00	For	Yes
CarbonCounter.org (see notes)	Very good	Climate Trust	International, Domestic	Renewable, Energy Efficiency, Sequestration	$10.00	Non	With Reservations
Carbonfund	Emission calculations too low	CCX, Green-e, ERT	International, Domestic	Renewable, Energy Efficiency, Sequestration	$5.50	Non	With Reservations
The CarbonNeutral Company	Emission calculations too low	Voluntary Carbon Standard version 1	International, Domestic	Renewable, Energy Efficiency, Sequestration, Methane Capture	$18.40	For	With Reservations
Climate Care	Emission calculations too low	NA	International	Renewable, Energy Efficiency, Sequestration	$12.57	For	With Reservations
Offsetters	Emission calculations too low	NA	International	Energy Efficiency, Sequestration	$13.03	Non	With Reservations
TerraPass	Emission calculations too low	Green-e, CCX, CRS	Domestic	Renewable, Energy Efficiency	$10.00	For	With Reservations
Better World Club	No air travel emissions calculator	N/A	Domestic	Energy Efficiency	$11.00	For	No
Cleanairpass	No air travel emissions calculator	CCX	International, Domestic	Renewable, Energy Efficiency, Sequestration	$7.98^2	For	No
Solar Electric Light Fund	No air travel emissions calculator	N/A	International	Renewable	$10.00	Non	No

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Notes

1 CarbonCounter.org has done a major overhaul of its webpage in early 2007 and now has much more detailed information about its calculator. It now also includes a factor of 2 to account for full radiative forcing. The customer can choose between an emissions estimate, by entering approximate number of hours flown, or calculate the exact emissions by entering the number of miles flown. CarbonCounter.org does not provide a link to an external site for customers to calculate the number of miles flown. The carbon emissions in our two examples would now be 0.36 /3.21 tons of CO2 respectively. That means that according to the criteria in this study, they no longer underestimate emissions from air travel. We did not update the numeric tables or graphs in section 7 and 8. We also did not update the pricing information. We did change the information in the final calculator evaluation graph and in the company profile in chapter 9