This picture taken on December 9, 2014 shows people cutting ice blocks used for Harbin international ice and snow festival from the frozen Songhua river in Harbin, northeast China's Heilongjiang province. As China's most famous and popular winter attraction, the annual festival is set to kick off on January 5, 2015 and last for a month, local media reported. (Photo by AFP Photo)

A boy walks on a deck, set in Dojran Lake, in southeastern Macedonia, Sunday, December 7, 2014. (Photo by Boris Grdanoski/AP Photo)

In this Tuesday, August 17, 2010 file photo, a view of the Canary Wharf financial district in London. A key adviser to the European Union's highest court is siding against Britain and wants the EU cap on bankers' bonuses to be maintained. Advocate General of the European Court of Justice Niilo Jaaskinen suggested Thursday, November 20, 2014 that British attempts to derail the EU financial law “should be rejected”, advising the court to dismiss the action. (Photo by Lefteris Pitarakis/AP Photo)

A boat sails on the Mediterranean sea at Cagnes sur Mer, near Nice, southeastern France, Sunday, December 7, 2014. The temperature rose to 18 degrees cels ius (64 fahrenheit). (Photo by Lionel Cironneau/AP Photo)

Ducks fly beneath contrails in the sky at dawn in west London November 24, 2014. (Photo by Toby Melville/Reuters)

A Christmas star on top of a sales booth is pictured against the colorful morning sky at the Christmas market in Dresden, eastern Germany, Friday, December 12, 2014. (Photo by Arno Burgi/AP Photo/DPA)

The summits of snow covered mountains are silhoutted during sunset in the western Austrian city of Innsbruck November 28, 2014. (Photo by Dominic Ebenbichler/Reuters)

Seagulls fly above the beach in Nice following heavy rains which hit southern France November 28, 2014. (Photo by Eric Gaillard/Reuters)

A passenger plane is silhouetted amongst the clouds, after heavy rains in southern France, as it flies above the Mediterranean Sea in Nice November 28, 2014. (Photo by Eric Gaillard/Reuters)

News photographers and journalists watch as the sun rises on the Delta IV Heavy rocket carrying the Orion spacecraft waiting for liftoff on the launch pad from the Cape Canveral Air Force Station in Cape Canaveral, Florida December 4, 2014. (Photo by Scott Audette/Reuters)

Pigeons fly into the ocean wind along the coastline in Encinitas, California December 4, 2014. (Photo by Mike Blake/Reuters)

A Qantas Airways Boeing 737-800 plane flies near storm clouds above Sydney December 7, 2014. The Australian Bureau of Meteorology issued a severe thunderstorm warning for Sydney and surrounding areas late this afternoon, stating that the storms were “likely to produce large hailstones, damaging winds and heavy rainfall that may lead to flash flooding in the warning area”. (Photo by David Gray/Reuters)

The factory of the company Kronospan is pictured during sunset at the east German town Lampertswalde December 8, 2014. Kronospan is a manufacturer of wood-based panels. (Photo by Hannibal Hanschke/Reuters)

A cross planted by NGO Rio de Paz (Peace Rio) on Copacabana beach, in memory of police officers killed is pictured in Rio de Janeiro December 9, 2014. Rio de Paz placed 152 black crosses symbolising the number of police officers killed in the last two years in Rio de Janeiro, according to NGO. (Photo by Sergio Moraes/Reuters)

A rainbow is seen from Manhattan Beach pier as an airplane takes off from Los Angeles International Airport (LAX) during heavy rains in Manhattan Beach, California, December 12, 2014. The National Weather Service forecast the system to track through southwestern California late on Thursday and into Friday, brining the possibility of strong thunderstorms, as well as waterspouts and small tornadoes along the coast. (Photo by Patrick T. Fallon/Reuters)

The downtown Los Angeles skyline is surrounded by clouds during heavy rains in Los Angeles, California December 12, 2014. (Photo by Patrick T. Fallon/Reuters)

Visitors to the Marin Headlands pose for photographs overlooking the Golden Gate Bridge and skyline of San Francisco, as a large cloud gathers over the city, December 12, 2014. A major storm pummeled California and the Pacific Northwest with heavy rain and high winds on Thursday, killing one man, knocking out power to tens of thousands of homes, disrupting flights and prompting schools to close. (Photo by Robert Galbraith/Reuters)

The sun sets behind oak trees after a rain storm in Los Angeles, California, December 12, 2014. A Pacific storm pounded Southern California with heavy rain and high winds on Friday, triggering flash floods and mudslides that prompted the evacuation of hundreds of homes, damaged dozens of others and disrupted passenger rail service along the coast. (Photo by Lucy Nicholson/Reuters)

A large cloud gathers over the skyline of San Francisco, California December 12, 2014. A major storm pummeled California and the Pacific Northwest with heavy rain and high winds on Thursday, killing one man, knocking out power to tens of thousands of homes, disrupting flights and prompting schools to close. (Photo by Robert Galbraith/Reuters)

A swimmer is seen before the traditional Christmas season swim in Monaco December 21, 2014. A hundred swimmers took part in the yearly event in the Mediterranean Sea waters which measured 16 degrees Celsius (60 degrees Fahrenheit). (Photo by Eric Gaillard/Reuters)

Members of the public enjoy a ride on the star flyer on December 18, 2014 in Edinburgh, Scotland. The star flyer is one of a number of rides situated in Princes Street Gardens in Edinburgh along with a ice rink carousel and Big Wheel, open from late November and running until January 4, 2015. (Photo by Jeff J. Mitchell/Getty Images)

A colorful sky at sunset over the snowy mountains in Immenstadt, Bavaria, Germany, 20 November 2014. Cloudy weather is forecast in the region on 21 November. (Photo by Karl-Josef Hildenbrand/EPA)

In this handout provided by National Aeronautics and Space Administration (NASA), Bright lights illuminate the United Launch Alliance Delta IV Heavy rocket with NASA's Orion spacecraft mounted on top is seen in the early hours of the morning atCape Canaveral Air Force Station's Space Launch Complex 37 on Decemeber 05, 2014 at Cape Canaveral, Florida. Orion is scheduled to launch and make its first flight test later in the morning. The spacecraft will orbit Earth twice, reaching an altitude of approximately 3,600 miles above Earth before landing in the Pacific Ocean. No one will be aboard Orion for this flight test, but the spacecraft is designed to allow us to journey to destinations never before visited by humans, including an asteroid and Mars. (Photo by Bill Ingalls/NASA via Getty Images)

Pakistani Muslims offer evening prayers at Clifton beach in Karachi, Pakistan, Thursday, November 20, 2014. (Photo by Fareed Khan/AP Photo)