Find forums that are about green/environmental/saving money/etc and post there.
Find blogs that are about these issues and write to the blog writer to see if they want to mention your website in their blog.
Ask people that register on your site to forward to their friends (in a nice, non-pushy way)
Use facebook, hi5, hyves, linkedin to promote your website in your profile.
Ask your "friends" on these sites to do the same.
Good luck!
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