The pre-Alpine region near Bernbeuren, southern Germany, is pictured during the sunrise on December 16, 2016. / AFP PHOTO / dpa / Karl-Josef Hildenbrand / Germany OUTKARL-JOSEF H

Karl-Josef Hildenbrand/dpa/AFP

The pre-Alpine region near Bernbeuren, southern Germany, is pictured during sunrise. Photo Karl-Josef Hildenbrand/dpa/AFP 

A woman and a boy walk past a flock of dead goats in a dry land close to Dhahar in Puntland, northeastern Somalia, on December 15, 2016.  Drought in the region has severely affected livestock for local herdsmen.  / AFP PHOTO / MOHAMED ABDIWAHABMOHAMED ABDIWAHAB/AFP/Getty Images

Mohamed Abdiwahab/AFP/Getty

A woman and a boy walk past a flock of dead goats in a dry land close to Dhahar in Puntland, northeastern Somalia. Drought in the region has severely affected livestock for local herdsmen. Photo Mohamed Abdiwahab/AFP/Getty 

Bangladeshi residents take part in a parade to mark the country's 45th Victory Day in Dhaka on December 16, 2016.  Bangladesh, led by the country's founder Sheikh Mujibur Rahman, won independence from Pakistan after a bitter nine-month war in 1971. / AFP PHOTO / MUNIR UZ ZAMANMUNIR UZ ZAMAN/AFP/Getty Images

Munir UZ Zaman/AFP/Getty

Bangladeshi residents take part in a parade to mark the country’s 45th Victory Day in Dhaka. Photo Munir UZ Zaman/AFP/Getty

Azad Hassan (L), whose hand was chopped off by Islamic State militants, cries as he stands beside his wounded father in a house at Nimrud village, south of Mosul, Iraq, December 13, 2016. Picture taken December 13, 2016. REUTERS/Mohammed Salem

Mohammed Salem/Reuters

Azad Hassan (L), whose hand was chopped off by Islamic State militants, cries as he stands beside his wounded father in a house at Nimrud village, south of Mosul, Iraq. Photo Mohammed Salem/Reuters 

A propaganda troupe perform before the Arch of Triumph on the last day of the 200-day campaign in Pyongyang on December 15, 2016. North Korea wrapped up a 200-day mass mobilisation campaign aimed at boosting an economy struggling with upgraded UN sanctions imposed after its two nuclear tests this year. Coming hard on the heels of a similar 70-day campaign that ended in May, the 200-day version kicked off in early June, pushing extra hours and working weekends.  / AFP PHOTO / KIM Won-JinKIM WON-JIN/AFP/Getty Images

Kim Won-Jin/AFP/Getty

A propaganda troupe perform before the Arch of Triumph on the last day of the 200-day campaign in Pyongyang. Photo Kim Won-Jin/AFP/Getty 

A worker applies colour to strings which will be used to fly kites, on a roadside in Ahmedabad, India, December 15, 2016. REUTERS/Amit Dave     TPX IMAGES OF THE DAY

Amit Dave/Reuters

A worker applies colour to strings which will be used to fly kites in Ahmedabad, India. Photo Amit Dave/Reuters

Niger's President Mahamadou Issoufou (C)  is welcomed by European Commission President Jean-Claude Juncker (L) and European Council President Donald Tusk at the European Commission in Brussels, December 15, 2016.   / AFP PHOTO / EMMANUEL DUNANDEMMANUEL DUNAND/AFP/Getty Images

Emmanuel Dunand/AFP/Getty

Niger’s President Mahamadou Issoufou (C) is welcomed by European Commission President Jean-Claude Juncker (L) and European Council President Donald Tusk at the European Commission in Brussels. Photo Emmanuel Dunand/AFP/Getty 

A group of Star Wars fans dressed as Stormtroopers walk across Millennium Bridge in London, to celebrate the launch of Rogue One: A Star Wars Story, which is released nationwide today. PRESS ASSOCIATION Photo. Picture date: Thursday December 15, 2016. Photo credit should read: Matt Alexander/PA Wire

Matt Alexander/PA

A group of Star Wars fans dressed as Stormtroopers walk across Millennium Bridge in London, to celebrate the launch of Rogue One: A Star Wars Story, which is released nationwide today. Photo Matt Alexander/PA Wire 

 Actors dressed as shephereds mingle with the audience, ahead of a performance of the Nativity at Wintershall on December 14, 2016 in Guildford, England. Held in a barn on the Wintershall Estate for the last 26 years, the annual production tells the story of the birth of Jesus with a large cast and real farmyard animals.  (Photo by Leon Neal/Getty Images)

Leon Neal/Getty

Actors dressed as shepherds mingle with the audience, ahead of a performance of the Nativity at Wintershall Guildford, England. Photo Leon Neal/Getty

A wounded by sits inside an ambulance as Syrian civilians and their families gather at the rebel-held al-Amiriyah neighbourhood as they wait to be evacuated to the government-controlled area of Ramoussa on the southern outskirts of the city on December 15, 2016.  Russia, Syrian military sources and rebel officials confirmed that a new agreement had been reached after a first evacuation plan collapsed the day before amid fresh fighting. Syrian state television reported that some 4,000 rebels and their families were to be evacuated.    / AFP PHOTO / KARAM AL-MASRIKARAM AL-MASRI/AFP/Getty Images

Karam Al-Masri/AFP/Getty

A wounded boy sits inside an ambulance as Syrian civilians and their families gather at the rebel-held al-Amiriyah neighbourhood as they wait to be evacuated to the government-controlled area of Ramoussa. Photo Karam Al-Masri/AFP/Getty 

 A reflection on waste liquid shows a woman wawing Turkish and Free Syrian flags as an aid convoy to Aleppo organized by IHH Humanitarian Relief Foundation is about to leave, on December 14, 2016 in Istanbul.   Turkey's aid campaign for the besieged people of Aleppo continued with several nongovernmental organizations sending food, water and clothing. / AFP PHOTO / OZAN KOSEOZAN KOSE/AFP/Getty Images

Ozan Kose/AFP/Getty

A reflection on waste liquid shows a woman waving Turkish and Free Syrian flags as an aid convoy to Aleppo is about to leave Istanbul for Syria. Photo Ozan Kose/AFP/Getty 

A Chinese cook stands in the window of a local fish restaurant as he talks on his phone on December 14, 2016 in Beijing, China.  (Photo by Kevin Frayer/Getty Images)

Kevin Frayer/Getty

A Chinese cook stands in the window of a fish restaurant in Beijing as he talks on his phone Photo by Kevin Frayer/Getty Images 

Simon Dawson/Bloomberg

A trader speaks on fixed-line telephones on the trading floor of the open outcry pit at the London Metal Exchange Ltd, in London. Photo Simon Dawson/Bloomberg 

A herd of reindeers is seen inside an enclosure as herders select and sort them in the settlement of Krasnoye in Nenets Autonomous District, Russia, November 28, 2016. Picture taken November 28, 2016. REUTERS/Sergei Karpukhin TPX IMAGES OF THE DAY. SEARCH "REINDEER ARCTIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES. - RTX2UYV0

Sergei Karpukhin/Reuters

A herd of reindeers is seen inside an enclosure as herders select and sort them in the settlement of Krasnoye, Russia. Photo Sergei Karpukhin/Reuters 

A statue is covered during restoration work at Westminster Abbey on December 9, 2016 in London, England. Restoration work is continuing to transform part of the 13th-century Triforium into a new viewing and gallery area that will be open to the public for the first time. As well as exhibiting many historical objects from the abbey, the new £19m GBP space will give visitors views down over the abbey buildings and the neighbouring Palace of Westminster. The work is due to be completed by 2018.  (Photo by Dan Kitwood/Getty Images)

Dan Kitwood/Getty

A statue is covered during restoration work at Westminster Abbey in London, England. Restoration work is continuing to transform part of the 13th-century Triforium into a new viewing and gallery area that will be open to the public for the first time. The work is due to be completed by 2018. Photo Dan Kitwood/Getty Images 

A performer dressed as the Marvel comic character Iron Man arrives at the new attraction "Iron Man Experience" during a media tour in Hong Kong Disneyland, Wednesday, Dec. 14, 2016. Hong Kong Disneyland added an Iron Man-themed area in the hopes that the Marvel superhero's success at the Chinese box office will help draw more visitors to the underachieving resort. The Iron Man Experience include a thrill ride that will let visitors "take flight with Iron Man on an epic adventure" involving a "battle against alien invaders" across Hong Kong. (AP Photo/Kin Cheung)

Kin Cheung/AP

A performer dressed as the Marvel comic character Iron Man arrives at the new attraction “Iron Man Experience” during a media tour at Disneyland in Hong Kong. Photo Kin Cheung/AP 

Demonstrators clash with police during a protest in front of the National Congress in Brasilia on December 13, 2016.  Brazil's Senate approved Tuesday a 20-year freeze on government spending billed as the centerpiece of austerity reforms aimed at restoring economic health to the troubled Latin American giant. / AFP PHOTO / ANDRESSA ANHOLETEANDRESSA ANHOLETE/AFP/Getty Images

Andressa Anholet/AFP/Getty

Demonstrators clash with police during a protest in front of the National Congress in Brasilia, Brazil. Photo Andressa Anholet/AFP/Getty 

he 'Kongl. Teknologkoren' choir performs in Seglora church at the open-air museum Skansen in Stockholm, Sweden on Saint Lucy's Day, on December 13, 2016.    Saint Lucy's Day is a Christian feast day celebrated on 13 December in Advent, most commonly in Scandinavia. / AFP PHOTO / TT News Agency / Henrik MONTGOMERY / Sweden OUTHENRIK MONTGOMERY/AFP/Getty Images

Outhenrik Montgomery/AFP/Getty

The ‘Kongl. Teknologkoren’ choir performs in Seglora church at the open-air museum Skansen in Stockholm, Sweden on Saint Lucy’s Day. Photo Outhenrik Montgomery/AFP/Getty 

An Iraqi girl looks out the window of her family house at Namrod village in Iraq December 13, 2016. REUTERS/Mohammed Salem

Mohammed Salem/Reuters

An Iraqi girl looks out the window of her family house at Namrod village in Iraq. Photo Mohammed Salem/Reuters 

Indian fisherman from Koli community collects fish and prawns caught from the Arabian Sea at the Gorai beach in Mumbai, India, 13 December 2016. The process of preparing and drying fish and prawns is a smelly, backbreaking task that requires continual vigilance to ensure that the fish and prawns thoroughly dried.  EPA/DIVYAKANT SOLANKI

Divyakant Solanki/EPA

Indian fisherman from Koli community collects fish and prawns caught from the Arabian Sea at the Gorai beach in Mumbai, India. Photo Divyakant Solanki/EPA