The UN's latest aid appeal for Syria tops £5 billion - an amount that the organisation's High Commissioner for Refugees said is beyond the scope of the world's national aid budgets.
To put the amount into perspective, the UN points out that it is equivalent to what Brits spend on gardening each year:
Half the population at the Zaatari refugee camp are children. After escaping violence at home they are now growing up on the edge of war.
In my second special report, I see how charities in Zaatari are working with Syrian children to try to numb the painful trauma of war.
Zataari, a Syrian camp for more than 100,000 refugees, is a place so desolate that only the truly desperate would call it home.