Think Earth at Home: Grades 4-5 Think Earth at Home: Grades 4-5 Comics Waste Invaders (Part 1) Waste Invaders (Part 2) Discussion Questions Pollution is for the Birds (Part 1) Pollution is for the Birds (Part 2) Discussion Questions Activities Calculate Wastewater Try to Undo Pollution Weigh Advantages & Disadvantages Plan to Think Earth Take an Environmental Walk