The document discusses how witnessing a deer that died after eating plastic bags littered in a forest changed the author's attitude towards plastic usage. It notes how plastics do not decompose for many years and release toxins, damaging the environment. Some key ways plastics harm are by entering drainage systems and waterways, preventing water absorption in soil, and being mistaken for food by marine animals. The author advocates reducing plastic use by choosing reusable options and refusing plastic bags to help drive positive change.