![Diese Seite ist CO2 neutral. Deine auch? Prospekte und Sonderangebote - CO2 neutral bei kaufDA.de](http://www.kaufda.de/umwelt/buttons/CO2-neutral-weiss-100x100.jpg)
For every blog that embeds their button, they will plant a tree.* The service is free and the idea is to neutralize 50 years worth of your blog's CO2 emissions.
All you need to do to participate is write a brief blog post, add a button of your choice to it, and write an email about your post to CO2-neutral[at]kaufda[dot]de.
* One tree per domain.
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