 increasing the time that a lightbulb lasts has a positive impact on the environment by decreasing the number of light bulbs discarded in landfills & if a sound decays is discarded in a recreation then that screen is dust -> increasing the time that a lightbulb lasts has a positive impact on the environment by decreasing the amount of trash discarded in landfills increasing the time that a lightbulb lasts has a positive impact on the environment by decreasing the amount of trash discarded in landfills