"For all [these] crises... an immediate injection of funds plus safe and unimpeded access are required to enable partners to avert a catastrophe; otherwise, many people will predictably die from hunger, livelihoods will be lost, and political gains that have been hard-won over the last few years will be reversed", he warned.
"We stand at a critical point in history", Mr O'Brien told the Security Council on Friday.
The United Nations humanitarian chief Stephen O'Brien has said that the world is facing its largest humanitarian crisis in 72 years. In Yemen, two-thirds of the population, or some 18.8 million people, are in need of assistance as Saudi Arabia and Iran continue a proxy war on the country.
"The people will die if coordinated and collective effort is not being carried out; the children will astray, the number of out of schools children will increase; their way of living will be destroyed; the benefits coming out of development work will also be destroyed".
United Nations agencies say 100,000 people are facing starvation in South Sudan, while a further million are classified as being on the brink of famine.
The under secretary-general for humanitarian affairs announced that UN Secretary General Antonio Guterres will chair a pledging conference for Yemen on 25 April in Geneva.
More than 7.5 million people in the country need aid, he said, over one million more than previous year. "Parties to the conflict are parties to the starvation - as are those not intervening to make the violence stop", stressed Mr. O'Brien, calling on the South Sudanese authorities to translate their assurances of unconditional access into "action on the ground".
Jennifer Lopez has moved on to Alex Rodriguez, report says
Some celebrities are overly bothered by age but as for Jennifer , she does not care if her dating partner is younger than her. Rodriguez previously had been dating Silicon Valley CEO Anne Wojcicki , but Page Six recently reported about their breakup .
Mineral Points To A Water Rich Mars
The Mojave Crater on Mars, where some of the Martians meteorites retrieved on Earth are believed to have originated from. In addition to being soluble in water, whitlockite also contains phosphorous - a crucial element for life here on Earth.
Based aid group helping Syrians shut down in Turkey
The U.S. built several military bases in the two Kurdish cantons on the eastern part of the Euphrates during the civil war. Photos of McGurk's visit to Kobani surfaced on social media and he was seen meeting with former PKK fighters in Syria .
In Somalia, more than half of the population (6.2 million people) require aid, of whom 2.9 million are desperate. Estimates in December showed that there were 75,000 children at risk of starving to death.
He says the United Nations and its partners are ready to boost their response efforts but they need much more help with access and funding. "Meanwhile, the cholera outbreak that began in June 2016 has spread to more locations".
Mr O'Brien warned that close to one million children under the age of five would be "acutely malnourished" this year. Six years ago - the most recent Somalian starvation - the death toll was nearly 260,000 people.
O'Brien's third visit was to another country in humanitarian crisis - Somalia, where women and children "walk for weeks in search of food and water". "They have lost their livestock, water sources have dried up and they have nothing left to survive on", O'Brien said.
In north-east Nigeria, a seven-year uprising by the Islamist extremist group Boko Haram has driven 2.6 million people from their homes. But we need the access and the funds to do more.
"To be clear, we can avert a starvation".