Light Pollution
What Is Light Pollution?
Light pollution is the excessive or misdirected use of artificial light that brightens the night sky. It washes out the stars, disrupts ecosystems, and wastes energy. For many communities, it means losing the ability to see the Milky Way—a view that has inspired humanity for thousands of years.
09
Sep
Light Pollution
Why It Matters
The consequences of light pollution reach far beyond simply losing sight of the stars. Today, over 80% of people worldwide live under skies too bright to experience a natural night sky. This not only diminishes cultural and scientific connection to the cosmos but also harms the environment, as artificial light disrupts wildlife migration, feeding, and reproduction patterns. Poorly managed lighting also affects human health by interfering with natural sleep cycles and circadian rhythms. On top of that, inefficient outdoor lighting wastes billions of dollars in electricity each year, making light pollution an environmental, social, and economic issue.
Types of Light Pollution
Light pollution takes different forms in our communities. Skyglow is the brightening of the night sky over towns and cities, obscuring the stars. Glare occurs when lighting is excessively bright and causes visual discomfort, often reducing safety rather than improving it. Light trespass happens when unwanted light spills into homes, streets, or natural areas, disturbing both people and ecosystems. Clutter, such as clusters of bright billboards and streetlights, creates confusing visual environments while further contributing to the problem.
What We Can Do
The good news is that light pollution can be reduced through simple, effective solutions. Communities can promote dark-sky friendly lighting that directs light downward, reducing unnecessary brightness while still maintaining safety. Local policies that encourage responsible lighting practices help strike a balance between human needs and sky preservation. Public education and stargazing events play a key role in raising awareness and showing people what is possible when light pollution is reduced. By working together with schools, governments, and local organizations, we can take meaningful steps to restore our shared night sky and preserve it for generations to come.
