National Green Week kicks off  February 7-11, 2011 but schools can choose any week from now until April 22nd (Earth Day) to participate. The Green Education Foundation describes National Green Week below:

National Green Week 2011 is a FREE program. Schools and groups are encouraged to take this opportunity to spend time with their students discussing environmental issues and specifically what they can do to make a difference. Participate for the whole week, a day, or just one lesson or activity. On Earth Day 2011 (April 22 ) the GEF website will announce the impact of the combined efforts on behalf of all of the schools and green keepers.

Learn how your school and students can contribute HERE.

Science NetLinks has a set of Earth Day lessons that may be useful.