Here's a fun way to get the kids involved in your own efforts to go green. The Ecokids Website has free printable calendars for every month. Every day has an interesting fact or riddle. In July, you and the kids can celebrate "National Bog Day" on the 30th.
While you're there, click on their Play and Learn tab of the website. There's a glossary, games and activities, and "Eco-Guides" on many different topics. A great resource for older kids.