UNITED NATIONS - UN leaders marked World Refugee Day on Saturday with stirring calls for greater efforts to protect the over 42 million people worldwide forced to flee violent conflict and persecution, many lacking basic humanitarian needs, such as shelter, clean water and food. The theme for this years observance of World Refugee Day - 'real people, real needs - underscores how much refugees have lost and how much the humanitarian community must do to help them, said Secretary-General Ban Ki-moon in a message for the Day. Ban added there are gaps in meeting the basics: shelter, health services, education, food, clean water, sanitation, and protection from violence and abuse. According to the UN, the $543 million humanitarian appeal launched about a month ago to deal with the needs of Pakistans displaced has so far received only 30 per cent of the necessary funding. In his message on World Refugee Day, the UN chief said malnutrition levels and mortality rates are frequently higher in displaced populations, and single women and girls are especially vulnerable to exploitation. Noting that staying in school reduces exposure to such abuse, Mr Ban stressed that more resources are need to build and maintain education facilities for refugees. The Secretary-General said that meeting these and many other needs of refugees and internally displaced persons (IDPs) takes commitment and action. Solidarity must be the foundation of our response ... especially so at a time when the economic crisis is putting pressure on humanitarian and development budgets. UN High Commissioner for Refugees (UNHCR) Ant=nio Guterres said that this is a time of global uncertainty, which is particularly heightened for refugees and IDPs who have lost not only their livelihoods and homes, but their loved ones, their friends, their communities and their countries. Refugee children who fled the Central African Republic (CAR) to neighbouring Cameroon where mortality rates are sometimes seven times higher than the emergency level, are one of the many vulnerable groups, Guterres said in a message for World Refugee Day. He described the situation in Georgia, where IDPs have been living for 15 years in squalid, overcrowded collective centres lacking water, insulation from the cold and functioning sewage systems, highlighting conditions suffered by refugees and displaced worldwide. With adequate resources, much of the hardship can be minimized, said Guterres. But without that support, we are forced daily to make heart-breaking decisions that directly affect the lives and well-being of the millions of uprooted families we are charged with protecting. Hollywood actress and UNHCR Goodwill Ambassador, Angelina Jolie, who has produced a 30 second video for the Day, said that as an American she understood the strength that diversity has given my country - a country built by what some would now dismiss as asylum-seekers and economic migrants. Speaking at an event in Washington, DC, observing the Day, Ms Jolie said that refugees must not be simply viewed as a burden. They are the survivors. And they can bring those qualities to the service of their communities and the countries that shelter them. Other events designed to draw attention to the plight of refugees on Saturday include a concert at Washingtons Kennedy Centre by Congolese vocalist and bandleader Samba Mapangala, a football match between refugees in Australia, a musical performance by Kurdish refugees from Iran in northern Iraq and a film festival in Japan.