It’s not a pleasant job. But it is a vital one. In February of this year, Abdul Salam al-Aswad dug an absorption trench or pit near his tent in the al-Mawasi area of Khan Younis in the southern Gaza Strip and placed a homemade toilet with a wooden board raised on bricks to act as a seat over it. With Israel’s war on Gaza lurching into its 14th month, Gaza’s 1.9 million displaced people – who have found shelter mostly in tents and temporary structures erected to shield them from the elements –