This is an excellent compilation of resources for both teachers and students including Earth Day and other environmental lessons, links, and ideas.Description of Resources:
A tremendous number of good resources exist to teach about the environment in an integrated manner. However, many are too vague and lack enough substance to help a teacher get a handle on the resource and how to use it. So we’ve tried to focus on some of the best. They are located at: http://www.reacheverychild.com/feature/environment.html One of the links provides some very interesting data about "Environment Statistics by Country."
This site provides statistics that compare countries on environmental topics, among others things; it’s a great way to integrate math and science.