Tomorrow, March 29th, 2008 at 8pm local time, switch off all the lights for an hour! Join the millions participating in Earth Hour (of course there is a Facebook group, full of information).
Apart from the obvious idea of saving energy, it is important to also remember that light pollution has strong negative effects on a variety of organisms, from insects, to migrating birds, to hatchling turtles.The energy saving of one hour may not be much, but the political effect of the effort is worth it.
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During Earth Hour, you switch off the lights and other non-essential electronic devices. At 8:00 PM March 29th. You'll save electricity, but more importantly, you'll be making a point.
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March 29th is Earth Hour Day. From 8pm to 8pm in your local time zone, you are to switch off the lights and stuff.
A number of astronomers out for an early evening look at the stars will thank you, and the Earth will thank you.
More details here.
There is a nice article in this month's National Geographic about Light Pollution. Unlike most popular articles on the topic which focus on the visibility of stars - an aesthetic problem - this article focuses on the effect of continuous light on animals and humans:
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It's 8:30 dumbass
It's 2009, dumbass.