Nearly 4,000 cities and towns in 88 countries planned to join in the World Wildlife Fund-sponsored event, which has darkened Times Square billboards.
A new global warming treaty is being negotiated. The first round begins Sunday in Bonn, Germany.
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On the Net:
Earth Hour: http://www.earthhour.org
U.N. Secretary-General Ban Ki-moon's Earth Hour video: http://www.youtube.com/watch?v9bm7yR0HcVY
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