Children walk next to a sand dune during a voluntary tree-planting event organised by their school and the Wang family, on the edge of the Gobi desert, on the outskirts of Wuwei, Gansu province, China, April 16, 2021. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland. Experts say China's reforestation work has become more sophisticated over the years with the government benefiting from decades of experience and able to mobilise thousands of volunteers to plant trees, emulating frontline pioneers like the Wangs. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Medical staff work during a voluntary rapid antigen testing campaign for the coronavirus disease (COVID-19) at the Sopocachi market in La Paz, Bolivia, December 26, 2020. REUTERS/David Mercado 

A member of the medical personnel works at a voluntary rapid antigen testing campaign for the coronavirus disease (COVID-19) at a hospital in Prague, Czech Republic, December 16, 2020. REUTERS/David W Cerny 

A member of the medical personnel works at a voluntary rapid antigen testing campaign for the coronavirus disease (COVID-19) at a hospital in Prague, Czech Republic, December 16, 2020. REUTERS/David W Cerny 

A member of the medical personnel works at a voluntary rapid antigen testing campaign for the coronavirus disease (COVID-19) at a hospital in Prague, Czech Republic, December 16, 2020. REUTERS/David W Cerny 

A member of the medical personnel works at a voluntary rapid antigen testing campaign for the coronavirus disease (COVID-19) at a hospital in Prague, Czech Republic, December 16, 2020. REUTERS/David W Cerny 

A retired doctor who volunteered to work at the new Duesseldorf Airport Corona Test Centre holds a test stick before a voluntary coronavirus disease (COVID-19) test at the new Duesseldorf Airport Corona Test Centre in Duesseldorf, Germany, July 27, 2020. Travellers can receive a voluntary corona test at Duesseldorf Airport to avoid two weeks of quarantine. REUTERS/Wolfgang Rattay 

Retired doctor Henrik Wroblewski who volunteered to work at the new Duesseldorf Airport Corona Test Centre unpacks a test stick before a voluntary coronavirus disease (COVID-19) test at the new Duesseldorf Airport Corona Test Centre in Duesseldorf, Germany, July 27, 2020. Travellers can receive a voluntary corona test at Duesseldorf Airport to avoid two weeks of quarantine. REUTERS/Wolfgang Rattay 

Retired doctor Henrik Wroblewski, who volunteered to work at the new Duesseldorf Airport Corona Test Centre, is seen in Duesseldorf, Germany, July 27, 2020. Travellers can receive a voluntary coronavirus disease test (COVID-19) to avoid two weeks of quarantine at the test centre. REUTERS/Wolfgang Rattay 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. A Greek volunteer signals at an approaching raft, overcrowded with refugees, from a beach at sunset on the Greek island of Lesbos, November 17, 2015. REUTERS/Yannis Behrakis 

An old Palestinian man undergoes medical checks at a United Nations Relief and Work Agency (UNRWA)-run health center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A blind Palestinian girl uses a Braille system typewriter in her classroom at a United Nations Relief and Work Agency (UNRWA)-run al-Nour (Light) school for blind and visually impaired children in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

Palestinian refugees register their information to receive food supplies at a United Nations Relief and Work Agency (UNRWA)-run food distribution center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A dentist checks the teeth of a Palestinian boy at a United Nations Relief and Work Agency (UNRWA)-run health center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A veiled Palestinian teacher gestures as children attend a lesson at a United Nations Relief and Work Agency (UNRWA)-run school in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

Workers carry boxes containing food supplies for Palestinian refugees at a United Nations Relief and Work Agency (UNRWA)-run food distribution center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A Palestinian newborn is vaccinated at a United Nations Relief and Work Agency (UNRWA)-run health center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A Palestinian girl undergoes an eye test at a United Nations Relief and Work Agency (UNRWA)-run health center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

Palestinian women wait to undergo medical checks at a United Nations Relief and Work Agency (UNRWA)-run health center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

Visually impaired Palestinian children play at the United Nations Relief and Work Agency (UNRWA)-run al-Nour (Light) school for blind and visually impaired children in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A veiled Palestinian teacher stands next to children as they queue at a United Nations Relief and Work Agency (UNRWA)-run school in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A visually impaired Palestinian girl plays the piano at a United Nations Relief and Work Agency (UNRWA)-run al-Nour (Light) school for blind and visually impaired children in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

An employee looks out the window of a store at a United Nations Relief and Work Agency (UNRWA)-run food distribution center in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

A visually impaired Palestinian girl is pictured through a window as she sits in her classroom at a United Nations Relief and Work Agency (UNRWA)-run al-Nour (Light) school for blind and visually impaired children in Gaza September 22, 2015. As the United Nations celebrates its 70-year anniversary this year, Reuters documents the work of the organisation's main aid agency in the Gaza Strip, the United Nations Relief and Works Agency (UNRWA). The agency runs schools including the al-Nour (Light) School for the Blind and Visually Impaired Children in Gaza City and has helped families to repair their homes or find temporary alternatives following the 2014 Gaza conflict. UNRWA said in January that a lack of international funding forced it to suspend cash payments for repairs to homes. The enclave has been under Israeli blockade for years and the two sides have waged two other wars since Hamas took control of Gaza in 2007. The agency is mostly funded by voluntary contributions and has struggled to keep pace with demand for its services, the U.N. said in August. Picture taken September 22, 2015. REUTERS/Mohammed Salem 

Volunteers' name badges are pictured at the entrance of a clothing depot for migrants in a fair hall in Hamburg, Germany September 24, 2015. A tide of refugees from the Middle East and Asia showed no sign of abating on Thursday, after European Union leaders began the task of trying to prevent tens of thousands of people fleeing war or poverty from streaming unchecked through the continent. REUTERS/Fabian Bimmer 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. A local volunteer signals to refugees overcrowding a dinghy to approach at a beach on the Greek island of Lesbos after crossing a part of the Aegean Sea from Turkey (seen in the background) September 18, 2015. REUTERS/Yannis Behrakis TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY 

Journalists work on their computers as French President Francois Hollande attends a news conference at the Elysee Palace in Paris February 5, 2015. Hollande, whose popularity has risen on the back of his handling of the Charlie Hebdo attacks, is expected to make announcements on plans for a new voluntary civilian service for school-leavers and to address the sense of alienation in France's poor suburbs. His comments on efforts to reach a new debt deal between Greece and EU partners will also be closely watched. REUTERS/Philippe Wojazer (FRANCE - Tags: POLITICS MEDIA) 

William Luz (R), who was recently released from the Barnstable County House of Corrections, works as a cook at a restaurant in Sandwich, Massachusetts August 29, 2014. Luz is a participant in the jail's intensive voluntary recovery program for opiate-addicted inmates, including the job placement assistance that helped Luz into his cooks position and receiving injections of Vivitrol, a non-narcotic drug that blocks receptors in the brain and bars addicts from getting high off of heroin and other opioids for about 25 days, at a cost of about $1,000 a shot. Picture taken August 29, 2014. To match Feature USA-HEROIN/PRISONS/ REUTERS/Brian Snyder (UNITED STATES - Tags: SOCIETY CRIME LAW DRUGS HEALTH) 

William Luz, who was recently released from the Barnstable County House of Corrections, works as a cook at a restaurant in Sandwich, Massachusetts August 29, 2014. Luz is a participant in the jail's intensive voluntary recovery program for opiate-addicted inmates, including the job placement assistance that helped Luz into his cooks position and receiving injections of Vivitrol, a non-narcotic drug that blocks receptors in the brain and bars addicts from getting high off of heroin and other opioids for about 25 days, at a cost of about $1,000 a shot. Picture taken August 29, 2014. To match Feature USA-HEROIN/PRISONS/ REUTERS/Brian Snyder (UNITED STATES - Tags: SOCIETY CRIME LAW DRUGS HEALTH) 

William Luz, who was recently released from the Barnstable County House of Corrections, works as a cook at a restaurant in Sandwich, Massachusetts August 29, 2014. Luz is a participant in the jail's intensive voluntary recovery program for opiate-addicted inmates, including the job placement assistance that helped Luz into his cooks position and receiving injections of Vivitrol, a non-narcotic drug that blocks receptors in the brain and bars addicts from getting high off heroin and other opioids for about 25 days, at a cost of about $1,000 a shot. Picture taken August 29, 2014. To match Feature USA-HEROIN/PRISONS/ REUTERS/Brian Snyder (UNITED STATES - Tags: SOCIETY CRIME LAW DRUGS HEALTH) 

A voluntary worker gives a bowl of soup to a man at the Mother Teresa of Calcutta eating center in Caracas March 17, 2014. The center, located in a back-street of Caracas, is frequented by the unemployed and homeless, as well as those who work but are unable to make ends meet. Shortages of basic products have become the norm in Venezuela over the last year and workers at soup kitchens face an increasingly difficult task of finding staple foods they need to provide a free hot daily meal. Opponents of Venezuela's President Nicolas Maduro's government say the queues are a national embarrassment and symbol of failed socialist economics similar to the old Soviet Union. But officials say businessmen are deliberately hoarding products as part of an "economic war" against Maduro. Picture taken March 17, 2014. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: POLITICS SOCIETY FOOD)

ATTENTION EDITORS: PICTURE 04 OF 27 FOR PACKAGE 'HUNGRY IN CARACAS'
SEARCH 'BOLIVAR CARACAS' FOR ALL IMAGES 

Heavy equipment works on the demolition of a home destroyed by Superstorm Sandy in the Oakwood Beach section of Staten Island in New York City October 24, 2013. New York State Governor Andrew Cuomo, who has said that area should be returned to nature, initiated on February 2013 a voluntary $400 million buyback program for some 418 homes in the low-lying neighborhood situated between salt marshes and the Atlantic Ocean that was devastated by surging floodwaters in the historic October 29, 2012 hurricane. As the one year anniversary of the storm approaches and as demolition begins, homes in Oakwood beach now lay mostly vacant and abandoned as the modest ocean-side neighborhood which now resembles a ghost town is set to all but disappear. Picture taken October 24. REUTERS/Mike Segar (UNITED STATES - Tags: DISASTER BUSINESS CONSTRUCTION REAL ESTATE ENVIRONMENT) 

A vendor selling live fishes and chickens stands at a shop in a market on the outskirts of Beijing, June 20, 2013. China is expanding a pilot system that tracks the movement of meat and vegetables to the supermarket shelf as part of efforts to tighten supervision of its scandal-plagued food industry. Under the programme, which is voluntary, city governments are monitoring produce as its leaves slaughter houses and wholesale markets to make sure the same food arrives at the supermarket and to get unlicensed vendors out of the supply chain. Picture taken June 20, 2013. REUTERS/Kim Kyung-Hoon (CHINA - Tags: FOOD POLITICS HEALTH) 

A butcher cuts meat in a market on the outskirts of Beijing, June 20, 2013. China is expanding a pilot system that tracks the movement of meat and vegetables to the supermarket shelf as part of efforts to tighten supervision of its scandal-plagued food industry. Under the programme, which is voluntary, city governments are monitoring produce as its leaves slaughter houses and wholesale markets to make sure the same food arrives at the supermarket and to get unlicensed vendors out of the supply chain. Picture taken June 20, 2013. REUTERS/Kim Kyung-Hoon (CHINA - Tags: FOOD POLITICS HEALTH) 

A soldier uses a welding torch to destroy a gun handed in by a resident during the "Voluntary Disarmament Programme" at the Venustiano Carranza district in Mexico City February 18, 2013. The programme, run by the Mexico City government with support of the Army and the Catholic Church, aims to swap weapons for money or a tablet to promote voluntary disarmament and avoid accidents, local media reported. REUTERS/Tomas Bravo (MEXICO - Tags: ANIMALS CIVIL UNREST MILITARY POLITICS SOCIETY) 

A union supporter dressed in a santa suit waits outside the Senate chamber doors. Labor union members and supporters demonstrate in opposition to a proposed right-to-work measure in Lansing, Michigan December 11, 2012. Michigan Republicans surprised labor unions on Thursday by pushing through the legislature in a day a proposal making union membership and dues voluntary in the private sector. REUTERS/James Fassinger (UNITED STATES - Tags: CIVIL UNREST BUSINESS EMPLOYMENT POLITICS) 

Labor union members and supporters demonstrate in opposition to a proposed right-to-work measure inside the Capitol building in Lansing, Michigan December 11, 2012. Michigan Republicans surprised labor unions on Thursday by pushing through the legislature in a day a proposal making union membership and dues voluntary in the private sector. REUTERS/James Fassinger (UNITED STATES - Tags: CIVIL UNREST BUSINESS EMPLOYMENT POLITICS) 

Labor union members and supporters hang a flag in the Capitol rotunda as they demonstrate in opposition to a proposed right-to-work measure inside the capitol building in Lansing, Michigan December 11, 2012. Michigan Republicans surprised labor unions on Thursday by pushing through the legislature in a day a proposal making union membership and dues voluntary in the private sector. REUTERS/James Fassinger (UNITED STATES - Tags: CIVIL UNREST BUSINESS EMPLOYMENT POLITICS) 

Labor union members and supporters demonstrate in opposition to a proposed right-to-work measure in Lansing, Michigan December 11, 2012. Michigan Republicans surprised labor unions on Thursday by pushing through the legislature in a day a proposal making union membership and dues voluntary in the private sector. REUTERS/James Fassinger (UNITED STATES - Tags: CIVIL UNREST BUSINESS EMPLOYMENT POLITICS) 

Luca, who attends a voluntary ecological year, works at Prinzessinengarten urban gardening project Berlin, September 7, 2012. Picture taken September 7, 2012. REUTERS/Thomas Peter (GERMANY - Tags: ENVIRONMENT SOCIETY) 

Luca, who attends a voluntary ecological year, works at Prinzessinengarten urban gardening project Berlin, September 7, 2012. Picture taken September 7, 2012. REUTERS/Thomas Peter (GERMANY ) 

A coal miner is kissed by a colleague after leaving Santiago Pozo mine, where they had been taking part in a voluntary industrial sit-in action for the past 50 days, according to local media, in Caborana, near Oviedo, northern Spain July 16, 2012. REUTERS / Eloy Alonso (SPAIN - Tags: BUSINESS CIVIL UNREST ENERGY EMPLOYMENT) 

A coal miner cries after leaving the Pozo Santiago mine, where miners had been taking part in a voluntary industrial sit-in action for the past 50 days, according to local media, in Caborana, near Oviedo, northern Spain July 16, 2012. REUTERS / Eloy Alonso (SPAIN - Tags: BUSINESS CIVIL UNREST ENERGY EMPLOYMENT TPX IMAGES OF THE DAY) 

From L-R: Toma Adeng, Maria Abuk, Mary Achol, and Martha Akuch, who work as voluntary birth attendants, pose for a photograph at the Malualkon Primary Health Care Center in Malualkon, in the South Sudanese state of Northern Bahr el Ghazal, June 1, 2012. As in many developing nations, international aid is both an invaluable help to South Sudan and a crutch that sometimes enables it to avoid reality. Development experts have grown more sophisticated in recent decades about how they deliver aid. But in fragile states such as South Sudan, getting the balance right between helping a country and helping that country help itself remains incredibly difficult. Picture taken June 1, 2012. To match Special Report SOUTH-SUDAN/AID REUTERS/Adriane Ohanesian (SOUTH SUDAN - Tags: ANNIVERSARY HEALTH SOCIETY PORTRAIT) 

A receptionist works in front of the logo of Renesas Electronics Corp at the company's headquarters in Tokyo July 3, 2012. Japan's loss-making Renesas Electronics Corp said on Tuesday it will seek to cut around 5,000 jobs through voluntary redundancies by the end of October. REUTERS/Yuriko Nakao (JAPAN - Tags: BUSINESS EMPLOYMENT SCIENCE TECHNOLOGY) 

Buffalo Bills defensive end Shawne Merriman (C) works out during the team's first voluntary off-season conditioning session, in the fieldhouse at Ralph Wilson Stadium in Orchard Park, New York April 23, 2012. REUTERS/Doug Benz (UNITED STATES - Tags: SPORT FOOTBALL) 

Buffalo Bills running back Fred Jackson (L) works out during the team's first voluntary off-season conditioning session, in the fieldhouse at Ralph Wilson Stadium in Orchard Park, New York April 23, 2012. REUTERS/Doug Benz (UNITED STATES - Tags: SPORT FOOTBALL) 

Buffalo Bills corner back Terrence McGee works out during the team's first voluntary off-season conditioning session, in the fieldhouse at Ralph Wilson Stadium in Orchard Park, New York April 23, 2012. REUTERS/Doug Benz (UNITED STATES - Tags: SPORT FOOTBALL) 

Buffalo Bills punter Brian Moorman works out on the field during the team's first voluntary off-season conditioning session, in the fieldhouse at Ralph Wilson Stadium in Orchard Park, New York April 23, 2012. REUTERS/Doug Benz (UNITED STATES - Tags: SPORT FOOTBALL) 

Precy Valencia, a penitent, has her feet nailed to a wooden cross as part of a voluntary ritual to mark the death of Jesus Christ on Good Friday in the town of Paombong in the Bulacan province, north of Manila, April 6, 2012. Numerous penitents were nailed to a cross on Good Friday in this display of religious devotion in the Philippines, a predominantly Catholic country. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: RELIGION SOCIETY) 

Rifles and shotguns handed in by residents are pictured during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: CRIME LAW SOCIETY) 

Ammunition handed in by residents is pictured during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: CRIME LAW SOCIETY) 

A resident holds his 22 caliber rifle as he waits to hand it in during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: CRIME LAW SOCIETY) 

Residents wait in line to hand their weapons and ammunition during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The state government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: CRIME LAW SOCIETY) 

Handguns handed in by residents are pictured during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: SOCIETY CRIME LAW) 

A soldier inspects a toy pistol handed in by a child during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: POLITICS CIVIL UNREST MILITARY) 

A soldier inspects a toy weapon handed in by a child during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: SOCIETY CIVIL UNREST MILITARY) 

Toy pistols handed in by residents are pictured during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: SOCIETY CIVIL UNREST) 

A resident (top) receives food stamps after handed in a pistol during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: SOCIETY CIVIL UNREST) 

A soldier patrols the perimeter where residents wait in line to hand in their weapons and ammunition during the "Guns Exchange Program" at a working class neighbourhood in Monterrey February 9, 2011. The State Government kicked off a program to swap weapons for food stamps to promote voluntary disarmament in the state of Nuevo Leon. More than 100 people, including 20 policemen, have been killed in drug violence in the city and its environs since New Year's Day. REUTERS/Tomas Bravo (MEXICO - Tags: POLITICS CIVIL UNREST MILITARY)