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Originally Posted by Jessica.
So is it to save money or because of light pollution??
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it's both and in some cases they will say it's to stop light pollution to save money.
There are arguments for and against. One could easily say that very few people benefit from lights being on in the middle of the night and its just not economically efficient. In terms of global warming, switching off the lights even for a few hours will do wonders for the environmental targets