2/3 of irrigated agriculture depends on mountain waters.

 

Mountain water sources, including glaciers and snowmelt, are critical for global food security as they supply freshwater for irrigation to over 40% of the world's agricultural land, impacting billions of people downstream. However, climate variations threatens this supply through rapid glacier melt, which can lead to initial flooding followed by long-term water shortages, reduced crop yields, and increased food insecurity, especially for mountain communities.

How mountains contribute to food security "Water towers of the world": 

Mountains store large amounts of water in glaciers and snowpack, slowly releasing it as a reliable source during warmer seasons and dry periods.

Irrigation: This stored water feeds major river systems, providing irrigation for agriculture in both mountain valleys and downstream lowlands, supporting 40% of global irrigation.
Supports agriculture: Reliable water access is crucial for crop production and livestock, with 70% of freshwater usage globally going to irrigation and agriculture.
Food security for communities: For many communities, especially in arid and semi-arid regions, mountain water is the primary source for both drinking water and food production.

The Challenges and threats are:

Climate variability: Rising global temperatures cause glaciers and snowpack to melt more rapidly, leading to a less predictable and eventually reduced supply of water.

Increased risk: The initial increased runoff from rapid melting can cause floods and landslides, damaging infrastructure and crops, while the long-term effect is a significant decrease in water availability.
Impact on crop yields: Reduced water availability directly lowers crop yields and livestock productivity, leading to decreased food security for millions of people.
Local constraints: Mountain communities also face other food security challenges, such as limited arable land on steep slopes and soil degradation from overgrazing.

Mountain water sources are vital for food security.