Without reforms, the world will be plunged into a water crisis that could be crippling for hot, dry countries, the UN warned yesterday.
In an annual report, the UN said abuse of water was now so great that on current trends, the world will face a 40 percent “global water deficit” by 2030 — the gap between demand for water and replenishment of it.
“The fact is there is enough water to meet the world’s needs, but not without dramatically changing the way water is used, managed and shared,” it said in its annual World Water Development Report.
“Measurability, monitoring and implementation” are urgently needed to make water use sustainable, said Michel Jarraud, head of agency UN-Water and the World Meteorological Organization.
Surging population growth is one of the biggest drivers behind the coming crisis, the report said.
The Earth’s current tally of approximately 7.3 billion humans is growing by about 80 million per year, reaching a likely 9.1 billion by 2050.
To feed these extra mouths, agriculture, which already accounts for about 70 percent of all water withdrawals, will have to increase output by approximately 60 percent.
The report pointed to a long list of present abuses, from contamination of water by pesticides, industrial pollution and runoff from untreated sewage, to over-exploitation, especially for irrigation.
More than half of the world’s population takes its drinking supplies from groundwater, which also provides 43 percent of all water used for irrigation.
About 20 percent of these aquifers are suffering from perilous over-extraction, the report said.
By 2050, global demand for water is likely to rise by 55 percent, mainly in response to urban growth.
“Cities will have to go further or dig deeper to access water, or will have to depend on innovative solutions or advanced technologies to meet their water demands,” the report said.
The overview, scheduled for release in New Delhi, draws together data from 31 agencies in the UN system and 37 partners in UN-Water.
It placed the spotlight on hot, dry and thirsty regions which are already struggling with relentless demand.
In the North China Plain, intensive irrigation has caused the water table to drop by more than 40m in some places, it said.
In India, the number of so-called tube wells, pulling out groundwater, rose from less than a million in 1960 to nearly 19 million 40 years later.
“This technological revolution has played an important role in the country’s efforts to combat poverty, but the ensuing development of irrigation has, in turn, resulted in significant water stress in some regions of the country, such as Maharashtra and Rajasthan,” the report said.
Water expert Richard Connor, the report’s lead author, said the outlook was bleak for some areas.
“Parts of China, India and the United States, as well as in the Middle East, have been relying on the unsustainable extraction of groundwater to meet existing water demands,” he said.
“In my personal opinion this is, at best, a short-sighted plan B. As these groundwater resources become depleted, there will no plan C, and some of these areas may indeed become uninhabitable,” he said.
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