The Facts

• Humanity faces a massive food and economic crisis amid worsening water shortages, particularly in regions producing 25-50% of the world's food crops.

• The OECD-backed Global Commission on the Economics of Water (GCEW) reported Wednesday that the crisis may cut high-income nations' GDP by 8%.

• Low-income nations' GDP may fall by 15% as the effects of changing rainfall pattern, temperature rise, and a lack of access to clean water wreak havoc, it reported.