For Teachers Green at Work Reuse, Reduce, Recycle (unit plan) Recycle, Reuse, Reduce (Unit) The Three R's of Human Responsibility - Reduce, Reuse, Recycle (several) Human Activity and the Earth (several)  Recycling - Math lesson plan Every Day is Earth Day Earth Day Mini-Units Earth Day Links & Activities   Keeping Our Planet Green - Free Presentations in PowerPoint format for K-12 Science  See Also: Acid Rain, Pollution For Kids Games & Kids Sites  Resources Free Clip Art Free Presentations in PowerPoint format for K-12 Science  Video Clips for Science    All Rights Reserved    Clip Art Credit: Phillip Martin Have a great year!