ABC News' Chris Cuomo will be going live from Paris on April 20, 2007, for the special "Planet Earth 2007: Seven Ways to Help Save the World." He will be standing in front of the Arc de Triomphe, located in the center of an exceptionally busy roundabout. He will talk about the effect of traffic on global warming.
The Eiffel Tower sparkles at the top of each hour for 10 minutes, from dusk until 2:00 a.m. (1:00 am in the winter). It took 25 mountain climbers and five months to install the 20,000 light bulbs on the Tower in 2003. (Christophe Schpoliansky/ABC News)