To help spread the word about global warming, a group of people have decided to ask everyone out there to unplug and turn off everything -- TVs, cars, etc. -- for one hour at noon on Sunday July 1, 2007. Since everyone would use their local time, not everyone everywhere would have everything off all at the same time, but it would be all the same day, which would still be quite effective.
How much impact would all of this have? Has anyone calculated it?