Light bulbs can cause pollution in several ways. For example many people still use halogen light bulbs in their homes. Halogen bulbs are quite inefficient compared to newer ecofriendly bulbs that are becoming more common. Because these bulbs are less efficient they require more energy to do the same job as an ecofriendly bulb and do not last as long. So not only do these bulbs contribute to landfills, but they contribute to more carbon emissions from power plants.
Yes they do, and recent studies suggest that energy-saving bulbs actually cause more pollution than their less resourceful counterparts. This is due to their mercury components; if not recycled properly, the mercury vapor contained in these bulbs can be a major pollutant. Though the amount of mercury in these bulbs is low (approximately 4 mg per bulb), consumers are urged to recycle used bulbs, either at point of sale of new bulbs or at local recycling facilities. Filament and halogen light bulbs do not need to be recycled; however, these bulbs require more carbon emissions during their production.
Light pollution inhibits the ability to see stars. While this type of pollution in itself is not harmful, it is considered a nuisance by many. People who enjoy meteor showers or star gazing must travel outside of city limits to reduce the glow from the concentration of lights.
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