EcoKids have produced a set of downloadable and printable Eco-Calendars for Teachers and Parents. The calendars have environmental dates, facts and riddles for children for every day of the year.
Elsewhere on the EcoKids site children can enjoy a selection of games and activities about wildlife, science and nature, energy and environmental issues. Usefully, especially for those long summer projects, the site includes over a 1000 pages of information on environmental topics.
From: BEST OF 2008: Eco-friendy and sustainable shoes