The following resources may be used to teach sustainability during the time of the Omer.
Curriculum Guide (Introduction)
Lesson One: Everything Comes From The Land
Lesson One: Everything Comes From The Land (Alternate for Older Classes)
Lesson Two: We Have to Maintain The Land
Lesson Three: Lessons of Sefirat HaOmer In Working Towards Izzun
Alternate Lesson Plan for More Text Oriented Groups