Share via Print In the countries coloured green, water use for producing export commodities exceeds the water use behind imported products net virtual water export.
Fresh water is a finite resource.
The amount of fresh water supply provided by the hydrological cycle does not increase. Water everywhere on the planet is an integral part of the global hydrologic cycle.
Precipitation originates as evaporation from land and the oceans. Soil moisture is used by plants, which return more moisture to the atmosphere, which then returns to Earth as rain or snow.
Humans share the Earth with other creatures who also need water, therefore, a water shortage is also a crisis for wildlife. Of the biodiversity hotspots designated by Conservation International, 10 are located in water-short regions.
The way we treat rivers reflects the way we treat each other. Rivers are running dry. Many major rivers—including the Colorado, Ganges, Indus, Rio Grande, and Yellow—are so over-tapped that they now run dry for part of the year.
Freshwater wetlands have shrunk by about half worldwide. Inthe Yellow River in China failed to reach the sea for the first time in history.
That year it failed on 15 days; every year since, it has run dry for a longer period of time, until init failed to reach the sea for days.
In addition, these rivers are replenished by the glaciers in the Himalayan Mountains—but these glaciers are all disappearing. Water tables are falling on every continent. Aquifer depletion is a new problem. India has the highest volume of annual groundwater overdraft of any nation in the world.
In most parts of the country, water mining is taking place at twice the rate of natural recharge, causing aquifer water tables to drop by 3 to 10 feet per year. This enormous shift from sustainable water use to over-mining began when farmers changed from having oxen withdraw the water from a well, to using electric or diesel-driven motors.
Countries are importing grain as a way to import water. It takes tons of water to grow one ton of grain. On the other hand, exporters of grain are exporting water.
Producing one ton of grain requires tons of water, but producing one ton of beef requires 15, tons of water, and nearly that much is required to produce a ton of cotton.
And they will be occurring at a time when world population is growing by more than 80 million a year. In effect, governments are currently satisfying the growing demand for food by over-pumping groundwater. S cores of countries are depleting their aquifers, including China, India, and the United States, which together produce half of the world grain harvest.
One third of a ton of grain sustains one person for one year current global average. Therefore, million tons of grain will feed million people. We are feeding ourselves with water that belongs to the next generation.
Farming needs to be done by using drip-sprinklers and other micro-irrigation systems, by changing cropping patterns and growing methods to get more crop per drop, and by adopting high-yielding and early-maturing crop varieties. Twenty Percent of Fresh Water is used by Industry.Water resources are natural resources of water that are potentially useful.
Uses of water include agricultural, industrial, household, recreational and environmental activities. All living things require water to grow and reproduce.
97% of the water on the Earth is salt water and only three percent is fresh water; slightly over two thirds of this is frozen in glaciers and polar ice caps. Bottled Mineral Water Plants – Demand of Mineral is growing very vastly in town. Mineral water using in every office, party, travel, schools, and home in every city of India.
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