Peter Birren <<email>> writes:

This weekend, on March 29 from 8-9 pm, it's Lights Out all over the world. There's a meeting of 200 local mayors in Chicago this afternoon (Mar 26) and the main topic is light pollution. Check out http://www.earthhourus.org/chicago.php.

I'm helping a group with a presentation at this meeting. There are several good reasons for limiting light pollution and changing the way cities are lit: from huge money savings in energy to better safety and security, to astronomy - or just being able to see the stars - there's also a direct link between city lighting and breast cancer.