Light pollution doesn't just make it more difficult for professional and backyard astronomers to observe the heavens, according to the 6.5-minute film, which is called "Losing the Dark." The loss of darkness also disrupts wildlife, wastes resources and adversely impacts human health.
"Exposure to light at night disrupts the circadian rhythms that regulate our sleep cycles," narrator Carolyn Collins Petersen says in the video, which was created by the International Dark Sky Association in collaboration with Loch Ness Productions as a public service announcement. "People working at night under bright lights or living in light-polluted cities face a higher risk of developing diseases such as breast and prostrate cancer."
But we are not powerless in the face of ever-encroaching light pollution, the video asserts. Indeed, three simple actions can help darken our skies and bring our energy bills down.
"We can replace light fixtures that send light up to the sky with ones that direct light down — exactly where we want it. They're called fully shielded fixtures," Collins Petersen says in the video. "We can also illuminate only the places that need it. And, of course, we can just turn off unnecessary lights."
"Losing the Dark" can be downloaded for free at the International Dark-Sky Association's website here: http://www.darksky.org/night-sky-conservation/290
The video's message is especially resonant now, during International Dark Sky Week. This annual celebration, which began in 2003 and runs from April 20-26 this year, aims to foster a better appreciation of the night sky, raise awareness about the problem of light pollution and inspire people to take action, event organizers said.
There are many events taking place around the world during International Dark Sky Week. Check out this skywatching website run by NASA's Jet Propulsion Laboratory in Pasadena, Calif., to see if any may be happening near you.