The United Nations is convening an aid conference in Geneva on Monday in an effort to raise more than $600 million for Afghanistan, warning of a humanitarian crisis there following the Taliban takeover.

Even before the Taliban’s seizure of Kabul last month, half the population – or 18 million people – was dependent on aid. That figure looks set to increase due to drought and shortages of cash and food, U.N. officials and aid groups warn.

About a third of the $606 million being sought would be used by the U.N. World Food Programme which found that 93% of the 1,600 Afghans it surveyed in August and September were not consuming sufficient foods, mostly because they could not get access to cash to pay for it.

“It’s now a race against time and the snow to deliver life-saving assistance to the Afghan people who need it most,” said WFP deputy regional director Anthea Webb. “We are quite literally begging and borrowing to avoid food stocks running out.”

The World Health Organization, another U.N. agency that’s part of the appeal, is seeking to shore up hundreds of health facilities at risk of closure after donors backed out.

REUTERS