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In page Water scarcity:

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The more developed countries of North America, Europe and Russia will not see a serious threat to water supply by 2025 in general. This is not only because of their relative wealth. Their populations will also be more in line with available water resources.[citation needed] North Africa, the Middle East, South Africa and northern China will face very severe water shortages. This is due to physical scarcity and too many people for the water that is available.[citation needed] Most of South America, Sub-Saharan Africa, southern China and India will face water supply shortages by 2025. For these regions, water scarcity will be due to economic constraints on developing safe drinking water, and excessive population growth.[citation needed]