Best estimates of future global agricultural water consumption (including both rainfed and irrigated agriculture), are of an increase of about 19% by 2050, but this could be much higher if crop yields and the efficiency of agricultural production do not improve dramatically.

UNESCO: CULTURE

Even relatively water-rich countries of the region, such as Malaysia, Indonesia, Bhutan and Papua New Guinea, now face water supply and quality constraints in their major cities because of population growth, growing water consumption, environmental degredation, damaging agricultural activities, poor management of water catchment areas, industrialization, and groundwater overuse.

UNESCO: CULTURE

For example, freshwater systems polluted with excess agricultural fertiliser will suffocate with algae, killing off fish and making water unfit for human consumption.

BBC: Nature loss 'to damage economies'