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After China and India, there is a second tier of smaller countries with large water deficits — Algeria, Egypt, Iran, Mexico, and Pakistan.
Four of these already import a large share of their grain.
Only Pakistan remains marginally self-sufficient.
But with a population expanding by 4 million a year, it will also soon turn to the world market for grain.
According to a UN climate report, the Himalayan glaciers that are the principal dry-season water sources of Asia's biggest rivers-Ganges, Indus, Brahmaputra, Yangtze, Mekong, Salween and Yellow-could disappear by 2035 as temperatures rise and human demand rises.
It was later revealed that the source used by the UN climate report actually stated 2350, not 2035.
Approximately 2. 4 billion people live in the drainage basin of the Himalayan rivers.
India, China, Pakistan, Afghanistan, Bangladesh, Nepal and Myanmar could experience floods followed by severe droughts in coming decades.
In India alone, the Ganges provides water for drinking and farming for more than 500 million people.

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