A model presents a creation during the Biofashion show in Cali, Colombia, on November 29, 2014. The designs are made from plants, recycled and natural materials. (Photo by Jaime Saldarriaga/Reuters)

A model presents a creation during the Biofashion show in Cali November 29, 2014. (Photo by Jaime Saldarriaga/Reuters)

A model presents a creation during the Biofashion show in Cali November 29, 2014. (Photo by Jaime Saldarriaga/Reuters)

A model presents a creation during the Biofashion show in Cali November 29, 2014. The designs are made from plants, recycled and natural materials. (Photo by Jaime Saldarriaga/Reuters)

Two bulls fight as villagers watch during an ethnic Dong traditional bullfighting contest in Congjiang county, Guizhou province, November 29, 2014. About 44 buffalos were part of the contest on Saturday. (Photo by Sheng Li/Reuters)

People celebrate with the winning bull after an ethnic Dong traditional bullfighting contest in Congjiang county, Guizhou province, November 29, 2014. (Photo by Sheng Li/Reuters)

Two bulls fight as villagers watch during an ethnic Dong traditional bullfighting contest in Congjiang county, Guizhou province, November 29, 2014. (Photo by Sheng Li/Reuters)

A model of a dinosaur skeleton is seen during a dinosaur exhibition, in front of a residential complex in Kunming, Yunnan province, November 30, 2014. (Photo by Wong Campion/Reuters)

A floral replica of the inflated Rubber Duck by Dutch conceptual artist Florentijn Hofman is seeb on display at a chrysanthemum exhibition in Shenzhen, November 29, 2014. (Photo by Reuters/Stringer)

Girls perform a traditional dance in an alley during an HIV/AIDS awareness programme on the eve of World AIDS Day in Kolkata November 30, 2014. World AIDS Day is observed on December 1 every year. (Photo by Rupak De Chowdhuri/Reuters)

An activist wears a skull mask during a protest in support of Russian doctors and patients against reforms to the healthcare system in Moscow November 30, 2014. Protesters opposed low wages of Moscow's doctors and the plan to optimize the healthcare system, according to local media. (Photo by Sergei Karpukhin/Reuters)

Gold bars and Swiss Franc banknotes are seen in this illustration picture taken at the GSA in Vienna November 13, 2014. Swiss voters looked set November 30, 2014, to clearly reject proposals that would have forced the central bank to buy up massive amounts of gold and imposed strict limits on immigration, threatening close economic ties to the European Union. The “Save our Swiss gold” initiative, proposed by the right-wing Swiss People's Party out of concern that the central bank has sold too much of its gold in the past, looked set to be rejected by 78 percent of voters, according to an initial projection of the voting trend from Swiss broadcaster SRF. (Photo by Leonhard Foeger/Reuters)

A competitor throws during the UK Christmas Tree Throwing Championships in Keele, central England, November 30, 2014. Participants taking part in the charity event must throw a 6 ft (1.8 m) tree, weighing about 10 kg (22 pounds), as far as possible and get the tree as high over a bar as they can. (Photo by Darren Staples/Reuters)

A competitor throws during the UK Christmas Tree Throwing Championships in Keele, central England , November 30, 2014. (Photo by Darren Staples/Reuters)

Policemen and rescue workers prepare to lift the wreckage of a police helicopter that crashed on a main avenue in Santiago, November 30, 2014. The helicopter pilot was seriously injured but no person was killed after the helicopter crashed in a street at Chile's capital, police said on Sunday. (Photo by Carlos Vera Alvarado/Reuters)

Locally made shells are launched by “Free Syrian Army” fighters towards forces loyal to Syria's President Bashar al-Assad in the Handarat area, north of Aleppo November 30, 2014. (Photo by Hosam Katan/Reuters)

Locally made shells are launched by “Free Syrian Army” fighters towards forces loyal to Syria's President Bashar al-Assad in the Handarat area, north of Aleppo November 30, 2014. (Photo by Hosam Katan/Reuters)

People cheer as pallbearers carry the coffin with the remains of late screenwriter Roberto Gomez Bolanos, after a mass to honour him at the Azteca stadium in Mexico City November 30, 2014. Mexican actor and screenwriter Roberto Gomez Bolanos, one of Latin America's most beloved comedians, whose slapstick acts charmed fans from Spain to Argentina for over four decades, died on Friday at the age 85. Known as “Chespirito”, a word play on “Little Shakespeare” for his diminutive stature and his prolific scripts, Gomez Bolanos created some of the region's most enduring comic characters. (Photo by Tomas Bravo/Reuters)

Pro-democracy protesters wearing helmets and goggles stand at a demonstration site near the office of the Chief Executive in Hong Kong December 1, 2014. Hong Kong police baton-charged and pepper-sprayed thousands of pro-democracy demonstrators in the early hours of Monday who were trying to encircle government headquarters, defying orders to retreat after more than two months of protests. (Photo by Tyrone Siu/Reuters)

A pro-democracy protester blocks a riot policeman during a clash outside the government headquarters in Hong Kong December 1, 2014. (Photo by Bobby Yip/Reuters)

A riot policewoman stands in between her colleagues during clashes with pro-democracy protesters outside the government headquarters in Hong Kong December 1, 2014. (Photo by Bobby Yip/Reuters)

Police officers beat up protesters as they try to disperse them outside government headquarters in Hong Kong Monday, December 1, 2014. Pro-democracy protesters clashed with police as they tried to surround Hong Kong government headquarters late Sunday, stepping up their movement for genuine democratic reforms after camping out on the city's streets for more than two months. (Photo by Vincent Yu/AP Photo)

Lava explodes from a volcano next to the village of Portela on Fogo Island November 28, 2014. Molten lava from a volcano in the Cape Verde archipelago slid towards the town of Cha das Caldeiras on Thursday, threatening to destroy it and a nearby village four days after an initial eruption. (Photo by Saulo Montrond/Reuters)

SoftBank Corp's human-like robot named “Pepper” gestures as it introduces Nestle's coffee machines at an electric shop in Tokyo December 1, 2014. Nestle SA started to use robots to help sell its coffee makers at electronics stores across Japan, becoming the first corporate customer for the chatty, bug-eyed androids unveiled in June by tech conglomerate SoftBank Corp. The waist-high robot, developed by a French company and manufactured in Taiwan, was touted by Japan's SoftBank as capable of learning and expressing human emotions, and of serving as a companion or guide in a country that faces chronic labour shortages. The maker of Nescafe coffee and KitKat chocolate bars plans to have the robots working at 1,000 stores by the end of next year, a Nestle official said. (Photo by Issei Kato/Reuters)

A monkey cowers as its trainer Qi Defang approaches during training for a circus in Suzhou, Anhui province, November 29, 2014. Suzhou is known as the hometown of circus troupes in China and has more than 300 circus troupes. (Photo by William Hong/Reuters)

A monkey is seen tied to a goat during training for a circus in Suzhou, Anhui province, November 29, 2014. (Photo by William Hong/Reuters)

A monkey is led by its trainer Qi Defang during training for a circus in Suzhou, Anhui province, November 29, 2014. (Photo by William Hong/Reuters)

Members of the hardline Islamic group, the Islamic Defenders Front (FPI), stab an effigy of Jakarta Governor Basuki Tjahaja Purnama or Ahok as they reject Ahok as their governor in front of Jakarta's city hall, December 1, 2014. Jakarta's first Christian governor in nearly 50 years was sworn in two weeks ago, despite protests from religious hardliners opposing a non-Muslim taking over one of Indonesia's most powerful political jobs. (Photo by Reuters/Beawiharta)

Members of a hardline Islamic group, the Islamic Defenders Front (FPI), burn an effigy of Jakarta Governor Basuki Tjahaja Purnama or Ahok, as they reject Ahok as their governor in front of Jakarta's city hall, December 1, 2014. (Photo by Reuters/Beawiharta)

Members of the “Skipper” yacht club dressed as Father Frost, the Russian equivalent of Santa Claus, greet the crew of another boat as they sail a yacht to mark the end of the sailboat season, with the air temperature at about minus 18 degrees Celsius (minus 0.4 degrees Fahrenheit), on the Yenisei River, outside Russia's Siberian city of Krasnoyarsk, November 30, 2014. (Photo by Ilya Naymushin/Reuters)

A masked CETEG (State Coordinator of Teachers of Guerrero) member loots a vending machine during a protest demanding the government find of missing students of the Ayotzinapa Teacher Training College Raul Isidro Burgos, at the General Attorney building in Chilpancingo, in the southern Mexican state of Guerrero December 1, 2014. Embattled President Enrique Pena Nieto on Thursday vowed to simplify Mexico's chaotic police structure and stop collusion between officials and drug gangs as he tried to defuse anger over the apparent massacre of 43 students in Septembe. (Photo by Jorge Dan Lopez/Reuters)