A girl plays with a curtain of water at Madureira park in Rio de Janeiro, Brazil, on January 25, 2014.  AFP PHOTO / YASUYOSHI CHIBAYASUYOSHI CHIBA/AFP/Getty Images

Yasuyoshi Chiba/AFP/Getty Images

A girl plays in a curtain of water at Madureira park in Rio de Janeiro, Brazil

Italy's Prime Minister Renzi talks during a joint news conference with Germany's Chancellor Merkel at the end of a meeting at the Galleria dell'Accademia in Florence...Italy's Prime Minister Matteo Renzi (R) talks during a joint news conference with Germany's Chancellor Angela Merkel at the end of a meeting at the Galleria dell'Accademia in Florence January 23, 2015. REUTERS/Alessandro Bianchi (ITALY - Tags: POLITICS)

Allesandro Bianchi/Reuters

Italy’s Prime Minister Matteo Renzi talks during a joint news conference with Germany’s Chancellor Angela Merkel at the end of a meeting at the Galleria dell’Accademia in Florence, Italy.

World Economic Forum in Davos...epa04570446 Members of Swiss special police forces stand on the roof of the Kongress Hotel next to the Congress Center, on the eve of the opening of the 45th Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland, 20 January  2015. The overarching theme of the meeting, which will take place from 21 to 24 January, is 'The New Global Context'.  EPA/JEAN-CHRISTOPHE BOTT

Jean Christophe Bott/EPA

Members of Swiss special police forces stand on the roof of the Kongress Hotel on the eve of the opening of the 45th annual meeting of the World Economic Forum in Davos, Switzerland.

A "Sadhu", or a Hindu holy man, offers prayers after taking a dip at the confluence of the river Ganges and the Bay of Bengal, ahead of the Makar Sankranti festival at Sagar Island, south of Kolkata January 13, 2015. Hindu monks and pilgrims are making their annual trip to Sagar Island for the one-day festival of Makar Sankranti on Wednesday. REUTERS/Rupak De Chowdhuri (INDIA - Tags: RELIGION SOCIETY)

Rupak De Chowdhuri/Reuters

A Hindu holy man offers prayers after taking a dip at the confluence of the river Ganges and the Bay of Bengal, ahead of the one-day Makar Sankranti festival at Sagar Island, south of Kolkata, India. Hindu monks and pilgrims are making their annual trip to Sagar Island for the festival on Wednesday.

A woman walks past houses that were heavily damaged by flash floods two month earlier in the coastal Moroccan village of Aglou, north of Sidi Ifni on January 12, 2015. The floods, that were described by the residents as the heaviest storms to hit southern Morocco in decades, killed at least 32 people and left others homeless. AFP PHOTO / FADEL SENNAFADEL SENNA/AFP/Getty Images

Fadeel Senna/AFP

A woman walks past houses that were heavily damaged by flash floods two months earlier, in the coastal Moroccan village of Aglou, north of Sidi Ifni. The floods, that were described by the residents as the heaviest storms to hit southern Morocco in decades, killed at least 32 people and left others homeless.

A Syrian man carries wood for a...TOPSHOTS A Syrian man carries wood for a fire in the rebel-held city of Douma on January 11, 2015. Three small girls and an elderly man have died in Syria in the past 24 hours due to bitterly cold temperatures and a week-long storm, a monitoring group said. AFP PHOTO/ ABD DOUMANYABD DOUMANY/AFP/Getty Images

ABD Doumany/AFP

A Syrian man carries wood for a fire in the rebel-held city of Douma.

Fashion designer Gareth Pugh unveils the Victoria and Albert (V&A) Museum's Christmas tree, tilted Ceremony, London. PRESS ASSOCIATION Photo. Picture date: Tuesday December 9, 2014. Photo credit should read: Anthony Devlin/PA Wire

Anthony Devlin/PA Wire

Fashion designer Gareth Pugh unveils the Victoria and Albert (V&A) Museum’s Christmas tree, titled Ceremony.

Residents take photos of snow-covered trees in Jilin, in northeast China's Jilin provinc

AFP/Getty Images

Residents take photos of snow-covered trees in Jilin, China’s northeastern province

A man photographs Anila Quayyum Agha's "Intersections" art work on the first day of ArtPrize at the Grand Rapids Art Museum in Grand Rapids, Mich. on Wednesday, Sept. 24, 2014. (AP Photo/The Grand Rapids Press

AP/Grand Rapids Press/Emily Rose Bennett

A man photographs Anila Quayyum Agha’s “Intersections” art work on the first day of ArtPrize at the Grand Rapids Art Museum in Michigan

Angry farmers dump cauliflowers in front of the prefecture building of Saint-Brieuc, northwestern France, as riot policemen onwatch, on September 24, 2014, as part of a protest against falling prices and revenues, as the vegetable sector is being hit by a drop in prices, and by a Russian embargo on Western products due to the crisis in Ukraine.  AFP PHOTO / FRED TANNEAU

Fred Tanneau/AFP

Angry farmers dump cauliflowers in front of the prefecture building of Saint-Brieuc, northwestern France, as riot police look on. The farmers are protesting against falling prices and revenues, as the vegetable sector is being hit by price drops, and by a Russian embargo on western products.

A Filipino boy swims among washed up rubbish in Manila bay, the Philippines, 23 September 2014. Countries and organizations began to announce measures to reduce greenhouse gas emissions and divest in fossil fuels on the one-day UN Climate Summit, where more pledges to reduce climate change are expected. Addressing the controversial issue of taxing or trading in carbon emissions, the World Bank on 22 September 2014, identified at least 73 countries that advocate putting a price on the release of carbon dioxide into the atmosphere. They represent a combined 54 per cent of global greenhouse gas emissions blamed for global warming, and include major emitters China, Russia and members of the European Union, emerging markets Indonesia, Mexico and South Africa, and vulnerable island countries including the Philippines, Kiribati and Nauru.  EPA/RITCHIE B. TONGO

Ritchie B Tongo/epa

A Filipino boy swims among the washed-up rubbish in Manila bay, the Philippines. Countries have begun announcing measures to reduce greenhouse gas emissions and cut fossil fuels during the one-day UN Climate Summit in New York

Syrian Kurdish refugee sleeps on the ground on the Turkish-Syrian border near town of Suruc in Sanliurfa province... A Syrian Kurdish refugee sleeps on the ground just outside the border fence on the Turkish-Syrian border, near the town of Suruc in Sanliurfa province September 23, 2014. More than 130,000 Syrian Kurds fleeing an advance by Islamic State militants have crossed into Turkey in the past three days and the authorities are preparing for more, Turkish Deputy Prime Minister Numan Kurtulmus said on Monday.   REUTERS/Murad Sezer

Murad Sezer/Reuters

A Syrian Kurdish refugee sleeps on the ground near the town of Suruç in the Sanliurfa province of Turkey, near the border with Syria

Elephants feast on a buffet of fruits an...Elephants feast on a buffet of fruits and vegetables as part of the annual King's Cup elephant polo tournament in Samut Prakan province on August 28, 2014.  The King's Cup elephant polo tournament, which is held annually to promote elephant projects and conservation, takes place from August 28 to 31.        AFP PHOTO / PORNCHAI KITTIWONGSAKULPORNCHAI KITTIWONGSAKUL/AFP/Getty Images

Pornchai Kittiwongsakul/AFP

Elephants feast on a buffet of fruits and vegetables as part of the annual King’s Cup elephant polo tournament in Samut Prakan province, Thailand. The tournament, which is held annually to promote elephant projects and conservation, takes place from August 28 to 31.

A Palestinian man walks past a fire in a street set by a home owner in an effort to keep mosquitoes away from their shattered homes in Shejaiya on August 27, 2014. Shejaiya was one of the hardest hit neighborhoods in fighting between Hamas militants and Israel during 50 days of fighting. Israel and Palestinians both boasted of victory in the Gaza war but analysts say Hamas received only promises while the conflict aggravated divisions in the Israeli leadership.  AFP PHOTO/ROBERTO SCHMIDTROBERTO SCHMIDT/AFP/Getty Images

Berto Schmidt/AFP

A Palestinian man walks past a fire lit by a homeowner in an effort to keep mosquitoes away from shattered homes in Shejaiya, Gaza. Shejaiya was one of the hardest-hit neighbourhoods after fighting between Hamas militants and Israel.

Pope Francis waves as he arrives to lead his weekly audience in Saint Peter's Square at the Vatican...Pope Francis waves as he arrives to lead his weekly audience in Saint Peter's Square at the Vatican August 27, 2014.  REUTERS/Max Rossi

Max Rossi/Reuters

Pope Francis waves as he arrives to lead his weekly audience in Saint Peter’s Square at the Vatican today.

A man peddles household goods to supporters of Qadri, during the Revolution March in Islamabad...A man peddles household goods to supporters (unseen) of populist cleric Tahir ul-Qadri, leader of political party Pakistan Awami Tehreek (PAT), in front of the Parliament house building during the Revolution March in Islamabad August 27, 2014. Thousands of protesters, led by opposition leader Imran Khan and Qadri, are now camped out in the heart of Islamabad - the so-called "Red Zone".  REUTERS/Akhtar Soomro (PAKISTAN - Tags: POLITICS CIVIL UNREST)

Akhtar Soomro/Reuters

A man sells household goods to supporters of populist cleric Tahir ul-Qadri, leader of political party Pakistan Awami Tehreek (PAT), in front of the Parliament house building, during the Revolution March in Islamabad, Pakistan.

Pakistani child, Harris Khan, 4, wearing a millitary uniform and holding a toy gun, poses for a picture while he and other Pakistanis celebrate the 68th Independence Day, in Islamabad, Pakistan, Thursday, Aug. 14, 2014. (AP Photo/Muhammed Muheisen)

Muhammed Muheisen/AP

Pakistani child, Harris Khan, 4, wearing a military uniform and holding a toy gun, poses for a picture while he and other Pakistanis celebrate the 68th Independence Day, in Islamabad, Pakistan.

Pope Francis arrives to attend a welcomi...Pope Francis arrives to attend a welcoming ceremony at the presidential Blue House in Seoul on August 14, 2014. Pope Francis arrived in Seoul looking to fuel a new era of Catholic growth in Asia -- a mission fraught with complex political challenges but huge potential rewards. AFP PHOTO / POOL / Kim Hong-JiKim Hong-Ji/AFP/Getty Images

Kim Hong-Ji/AFP

Pope Francis attends a welcoming ceremony at the presidential Blue House in Seoul, South Korea

A girl drags her goat heading back home through a main road empty of traffic and full of children playing, after being blocked by the Pakistani police with shipping containers, on the outskirts of Islamabad, Pakistan, Thursday, Aug. 14, 2014. Roads leading to the Capital are being blocked in run up to announced protests by cricketer-turned-politician Imran Khan and anti-government cleric Tahir-ul-Qadri. Both men want the government to step down and new elections to be held. (AP Photo/Muhammed Muheisen)

Muhammed Muheisen/AP

A girl and her goat head home down an empty main road full of children playing. The police blocked the road, on the outskirts of Islamabad, Pakistan, with shipping containers

a general view of apartment buildings destroyed by Israeli bombing in the Gaza Strip,

EPA

Apartment buildings destroyed by Israeli bombing in the Gaza Strip.