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Why we require an e-mail address and password

By entering your information on the Count Down Your Carbon website, you will be able to track the effects of your CO₂ reductions on the site across several visits. Information regarding actions that you have taken to lower your CO₂ emissions will be saved, allowing you to add to your reductions at any time. This also allows Count Down Your Carbon to calculate the combined impact of everyone's actions in a way that is truly representative of the effort made.

To ensure that we account properly for each individual's actions and don't double-count any contributions, we only count those actions associated with a valid and verified e-mail address. When you provide your e-mail address, Count Down Your Carbon will send you a message containing a link. By following this link, you prove to Count Down Your Carbon that that e-mail address is working and that you are its rightful owner.

Furthermore, we ask you to provide a password. This prevents an individual from manipulating another user's actions in the calculator. For increased security, we do not store this password on our server or transmit it over the network: only a salted cryptographic hash of the password is retained, greatly reducing the risk of password compromise.