Use light only when necessary (an obvious option, but harder to achieve than said), use lower wattage bulbs, and use a timer or motion sensor
Use of amber lights - reddish/orange lights which are on the low end of the visible light spectrum - an experiment conducted in Florida where LED street lights were changed to amber lights reduced the disorientation rate of sea turtles to zero percent
Reduce the "upward lights" (prevent lights from shining up into the atmosphere by putting covers on the light bulbs, directing the light down, or by planting trees to prevent the light from shining upward)
Light pollution is a relatively new form pollution that began with the invention of the light bulb. While it has drastically improved the quality of life for the human population, it has had adverse consequences on the environment. In modern times an ever increasing number of lights are being used for various reasons such as for safety or for extending working hours. Despite this there are viable and proven solutions for reducing light pollution. Since light pollution has a distinct cause, as compared to carbon or plastic pollution where there are several sources or persistence at sea, there is a more feasible solution for mitigation. Many countries, especially in Europe, have already started transitioning to amber lights and have reduced the brightness of highway lights where brighter lights are unnecessary.