A farmer makes his way on a tractor through a foggy winter landscape near Rosenheim, southern Germany, on Thursday, Jan. 27, 2011. (AP Photo/Matthias Schrader)

A farmer makes his way on a tractor through a foggy winter landscape near Rosenheim, southern Germany, on Thursday, Jan. 27, 2011. (AP Photo/Matthias Schrader)

A man walks along the Gleis 17 (Track 17) memorial with the name of the Nazi death camp Auschwitz at the train station Grunewald on the international Holocaust remembrance day in Berlin, Germany, on Thursday, Jan. 27, 2011. From Oct. 1941 until Feb. 1945 the train station was one of the major sites of deportations of Berlin’s Jewish community. (AP Photo/Markus Schreiber)

A man walks along the Gleis 17 (Track 17) memorial with the name of the Nazi death camp Auschwitz at the train station Grunewald on the international Holocaust remembrance day in Berlin, Germany, on Thursday, Jan. 27, 2011. From Oct. 1941 until Feb. 1945 the train station was one of the major sites of deportations of Berlin’s Jewish community. (AP Photo/Markus Schreiber)

Tourists make their way in a flooded St. Mark square as high tides reached 1.36 meters above sea level, flooding more than half of Venice, Friday, Dec. 3, 2010. Heavy rains have caused damage in the last days and are blamed for the recent collapses in ancient Pompeii, as many rivers swell, snow fell copiously on the Alps and high water is a constant presence in Venice. (AP Photo/Luigi Costantini) Read more →

Tourists make their way in a flooded St. Mark square as high tides reached 1.36 meters above sea level, flooding more than half of Venice, Friday, Dec. 3, 2010. Heavy rains have caused damage in the last days and are blamed for the recent collapses in ancient Pompeii, as many rivers swell, snow fell copiously on the Alps and high water is a constant presence in Venice. (AP Photo/Luigi Costantini)

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In this photo provided by the University of Dundee a satellite image of a snow covered UK is seen. The image was received Thursday Dec. 2, 2010 from NASA satellite Terra as snow and freezing temperatures continue to grip the British Isles. (AP Photo/NEODAAS/University of Dundee)

In this photo provided by the University of Dundee a satellite image of a snow covered UK is seen. The image was received Thursday Dec. 2, 2010 from NASA satellite Terra as snow and freezing temperatures continue to grip the British Isles. (AP Photo/NEODAAS/University of Dundee)

In this image made available from Britain’s Ministry of Defence, HMS Ark Royal sails into Portsmouth, England for the final time after it was announced that it would be decommissioned as part of the Government’s defense review, Friday Dec. 3, 2010. The aircraft carrier is the fifth Ark Royal. The first saw battle in 1588 and defeated the Spanish Armada. This latest, and possibly last Ark Royal, saw active service in the Balkans and the second Gulf War. Fleet flagship HMS Ark Royal returned to her home port of Portsmouth for the final time Friday, ending 25 years of service to the Royal Navy across the globe. (AP Photo/Kyle Heller/ MOD)

In this image made available from Britain’s Ministry of Defence, HMS Ark Royal sails into Portsmouth, England for the final time after it was announced that it would be decommissioned as part of the Government’s defense review, Friday Dec. 3, 2010. The aircraft carrier is the fifth Ark Royal. The first saw battle in 1588 and defeated the Spanish Armada. This latest, and possibly last Ark Royal, saw active service in the Balkans and the second Gulf War. Fleet flagship HMS Ark Royal returned to her home port of Portsmouth for the final time Friday, ending 25 years of service to the Royal Navy across the globe. (AP Photo/Kyle Heller/ MOD)

A woman is protected by umbrellas as she crosses Vuelta Castillo Park covered by snow in Pamplona, northern Spain, Friday Dec. 3, 2010. A polar wind is crossing the country as many parts of Spain registered freezing temperatures and snow storms. (AP Photo/Alvaro Barrientos)

A woman is protected by umbrellas as she crosses Vuelta Castillo Park covered by snow in Pamplona, northern Spain, Friday Dec. 3, 2010. A polar wind is crossing the country as many parts of Spain registered freezing temperatures and snow storms. (AP Photo/Alvaro Barrientos)

History enthusiasts ride their horses near the village of Tvarozna near the city of Brno, Czech Republic, Friday, Dec. 3, 2010. The re-enactment of battle of Austerlitz, celebrating its 205th anniversary, will take place on Saturday, Dec. 4, 2010. (AP Photo/Petr David Josek)

History enthusiasts ride their horses near the village of Tvarozna near the city of Brno, Czech Republic, Friday, Dec. 3, 2010. The re-enactment of battle of Austerlitz, celebrating its 205th anniversary, will take place on Saturday, Dec. 4, 2010. (AP Photo/Petr David Josek)

The afternoon sun shines over Sollihoegda, near the Norwegian capital of Oslo, Friday Dec. 3, 2010. In the last few days is has been very cold in many parts of the country and it is reported that these temperatures will continue in the coming days. (AP Photo by Kyrre Lien / SCANPIX)

The afternoon sun shines over Sollihoegda, near the Norwegian capital of Oslo, Friday Dec. 3, 2010. In the last few days is has been very cold in many parts of the country and it is reported that these temperatures will continue in the coming days. (AP Photo by Kyrre Lien / SCANPIX)

Bosnian soldier Dzenaida Sjencanin, 23, smiles as she is waiting for the start of the official ceremony marking the fifth anniversary of a Bosnian joint Army, at military barracks Rajlovac near Sarajevo, Bosnia, on Wednesday, Dec. 1, 2010. (AP Photo/Amel Emric)

Bosnian soldier Dzenaida Sjencanin, 23, smiles as she is waiting for the start of the official ceremony marking the fifth anniversary of a Bosnian joint Army, at military barracks Rajlovac near Sarajevo, Bosnia, on Wednesday, Dec. 1, 2010. (AP Photo/Amel Emric)

A young boy sleds in the snow in Bannockburn, Scotland as large areas of Britain were brought to a halt as the freezing weather tightened its grip Wednesday December 1, 2010. Heavy snow and subzero temperatures swept across Europe, killing at least eight homeless people in Poland, closing major airports in Britain and Switzerland, and causing delays to rail and road traffic across the continent. (AP Photo/Owen Humphreys/PA Wire)

A young boy sleds in the snow in Bannockburn, Scotland as large areas of Britain were brought to a halt as the freezing weather tightened its grip Wednesday December 1, 2010. Heavy snow and subzero temperatures swept across Europe, killing at least eight homeless people in Poland, closing major airports in Britain and Switzerland, and causing delays to rail and road traffic across the continent. (AP Photo/Owen Humphreys/PA Wire)

A snowplow removes the snow around a Lot aircraft while the Geneva International Airport is temporarily closed because of heavy snowfall, in Geneva, Switzerland, on Wednesday, Dec. 1, 2010. (AP Photo/Keystone, Salvatore Di Nolfi)

A snowplow removes the snow around a Lot aircraft while the Geneva International Airport is temporarily closed because of heavy snowfall, in Geneva, Switzerland, on Wednesday, Dec. 1, 2010. (AP Photo/Keystone, Salvatore Di Nolfi)

The paw of a swimming polar bear, enjoying the first snow, is pictured at the zoo in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)

The paw of a swimming polar bear, enjoying the first snow, is pictured at the zoo in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)

A Kamchatka Brown Bear rests in the first snow at the zoo in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)

A Kamchatka Brown Bear rests in the first snow at the zoo in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)

Snow on the tracks at Frankfurt’s main train station in Frankfurt, Germany, Monday Nov. 29, 2010. Winter weather has struck much of Europe, causing travel problems for much of the region. (AP Photo/ dapd/Mario Vedder)

Snow on the tracks at Frankfurt’s main train station in Frankfurt, Germany, Monday Nov. 29, 2010. Winter weather has struck much of Europe, causing travel problems for much of the region. (AP Photo/ dapd/Mario Vedder)

The photographer with an umbrella is reflected in a Christmas bubble in the snow in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)

The photographer with an umbrella is reflected in a Christmas bubble in the snow in Gelsenkirchen, western Germany, Monday, Nov. 29, 2010. Winter arrives all over Germany with heavy snowfall and ice. (AP Photo/Martin Meissner)