That's what people have been doing around the world, from an Antarctic research base to the Great Pyramids of Egypt and beyond, in an effort to draw attention to the threat of global climate change.

Even the glitz of the Las Vegas Strip will be dimmed in honor of a worldwide energy conservation campaign.

Nearly 4,000 cities and towns in 88 countries are taking part in the event sponsored by the World Wildlife Fund. Activists with the group are planning a candlelit cocktail party in Bonn, Germany, on the even of a U.N. climate change meeting. Tomorrow, talks begin there on a new international agreement for cutting greenhouse gas emissions. Scientists says the heat-trapping gases are dangerously warming the planet.