To make water use more efficient, says Koichiro Matsuura, the head of UNESCO, the main UN agency dealing with water, will require fundamental changes of behaviour.

• 处理水问题的主要联合国机构联合国教科文组织总干事松浦晃一郎说，要想更高效利用水资源，就需要我们在行为上做出彻底改变。