Christmas Tree Lights Around the World

The National Christmas Tree is lit in front of the White House during its lighting ceremony in Washington December 1, 2011. (Reuters/Molly Riley)

President Obama, first lady Michelle Obama and their daughters Sasha and Malia along with mother-in-law Marian Robinson at the annual National Christmas Tree Lighting in Washington. (AP Photo/Haraz N. Ghanbari)

The Christmas tree in Trafalgar Square after its lights were switched on in central London, December 1. (Reuters/Olivia Harris)

Fireworks light up the night sky near the giant Christmas Tree display in Puerto Princesa, Palawan city, west of Manila December 1. REUTERS/Romeo Ranoco

The 74-foot-tall Rockefeller Center Christmas tree is lit using 30,000 energy efficient LED lights during the 79th annual lighting ceremony, in New York, Nov. 30, 2011. (AP/Charles Sykes)

Britain's Prime Minister David Cameron with visiting civilians outside his official residence at 10 Downing Street in central London, after switching on the Downing Street Christmas tree lights, Dec. 1. (AP/Lefteris Pitarakis)

People crowd in front of the Christmas tree lighting ceremony in downtown Sofia, Bulgaria. (Reuters/Stoyan Nenov)

Fireworks explode around a Christmas tree during its lighting ceremony at Rodrigo de Freitas Lake in Rio de Janeiro November 26. (Reuters/Andre Durao)

Malta's Prime Minister Lawrence Gonzi (C) and Valletta mayor Alexiei Dingli (R) switch on the lights of a Christmas tree made out of over 2000 glass baubles, in the main street of Valletta, Malta. Reuters/Darrin Zammit Lupi