In many, many different ways. Gas emissions from fossil fuels burned by cars and for electricy, agricultural runoff from pesticides and fertilizers, littering, chemical leaching from electronics, mining — the list goes on and on and on.
Improper disposal of hazardous materials found in chemical cleaners and products that find their way into water systems. Manufacturing practices that emit chemicals into the atmosphere. Smoking cigarettes full of toxins that enter our airways! Burning other materials that release substances into the atmosphere.
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