世界气象组织：2021年全球水资源状况报告（英文版）

Impacts of climate variability and change are often felt through water. The dynamics of the water cycle and its interactions with human society result in varying spatio-temporal patterns of water resource availability and impacts of water-related extremes affecting life, development, and sustainability of ecosystems, societies and individuals. Despite prevailing La Niña conditions, the year 2021 was ranked as the fifth to seventh warmest on record, with the global annual mean temperature of 1