Philadelphia is about to go completely dark at night. Here’s why

Read the full story at Fast Company.

After 15 years of effort, Audubon Mid-Atlantic and several other local organizations have succeeded in convincing building owners to do more. Beginning April 1, and running for the duration of both the spring and autumn bird migration periods, buildings across Philadelphia will be voluntarily turning off their lights at night.

The initiative, Lights Out Philly, runs from April 1 to May 31 and again from August 15 to November 15, and it calls on building owners and managers to turn off, dim, or block any lights within buildings that are typically left on at night. It also calls for nonessential lights, such as those illuminating building signs or sponsor logos, to be turned off or switched to green or blue colors that are less likely to attract birds than red or white. For these twice-annual migration periods, turning off lights can help reduce the potentially deadly lure and distraction of buildings, keeping the tens of millions of birds that travel through Philadelphia along the Atlantic Flyway on their flight path.

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