The Gaza Strip, refuge for nearly 1.7-million Palestinians, will be uninhabitable by 2020.
"Action needs to be taken now if Gaza is to be a liveable place in 2020 and it is already difficult now," U.N. humanitarian coordinator Maxwell Gaylard told journalists when the report was released on Monday.
Five years into an Israeli blockade supported by Egypt, and living under one-party rule, Gaza's population of 1.6 million is set to rise by 500,000 over the next eight years, say the authors of the U.N.'s most wide-ranging report on the territory.
Gaza has one the youngest populations in the world, with 51 percent of people under the age of 18.
"Action needs to be taken right now on fundamental aspects of life: water sanitation, electricity, education, health and other aspects," Gaylard said.
..."Despite their best efforts the Palestinians in Gaza still need help," he said. "They are under blockade. They are under occupation and they need our help both politically and practically on the ground."