Understanding matter and its properties helps people make more sustainable choices by allowing them to choose materials that are safer, more durable, and less harmful to the environment. For example, knowing that plastics take hundreds of years to decompose might encourage someone to use reusable glass or metal containers instead. By understanding how materials react with heat, water, or air, people can also make better decisions about energy use, recycling, and reducing waste. Overall, knowledge of matter empowers individuals to make informed, eco-friendly, and safer choices in their daily lives.