Pollution, Harmful substances that make air, water, or land dirty, Recycling, Turning used materials into new products, Waste, Unwanted materials or trash, Air quality, How clean or dirty the air is, Clean water, Water that is safe to drink and use, Hygiene, Keeping yourself and surroundings clean to stay healthy, Environment, The natural world around us (air, water, land, Ecosystem, A system where plants, animals, and environment interact, Disease, Illness that affects people’s health, Conservation, Protecting and saving natural resources.

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