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How much light 'pollution' does humanity output collectively?

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The night light humans generate now however is mostly cold white and sodium yellow, while light to which humans were exposed from campfires (for 1million years) was mostly red and infrared, neither of which most humans get much of anymore, at least not if they live Western lifestyle. read more

Prohibits the use of state funds to install or replace a permanent outdoor lighting fixture on the grounds of any state building unless (1) the fixture is designed to maximize energy conservation and minimize light pollution, (2) the fixture emits only as much light as necessary for the intended purpose and (3) a restricted uplight fixture is used when the output is more than 1,800 lumens. read more

With 285 fixtures shining on 550 acres of runs, Oregon's Mount Hood Skibowl is the largest night ski area in the U.S.—drawing thousands of nine-to-fivers each season. read more

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