Another incredible activity we were able to do (because this school is better technologically equipped than many in my area) was to participate in an online carbon footprint calculator for kids! (green.thefuntimesguide.com)
Accordingly, disagreement with COTAP's carbon footprint calculator methodology or functionality, or input errors made by Users, will not be considered sufficient grounds for adjusting and / or refunding Contributions. (cotap.org)
There are plenty of carbon footprint calculators around. (treehugger.com)