The question is mostly one of fresh water. Liquid fresh water amounts to less than 1% of all the earth’s water, and its distribution is irregular. Desalination is expensive.
Is there enough? Evidently there is, in 2011. The future? Depends on a great many things including the size and nature and consumpion levels of the future population.
This is a tricky issue. Yes, there currently is enough water on Earth for human civilization. Approximately 2.5 percent of Earth’s water is fresh water and 70 percent of that water is frozen in the icecaps of Antarctica and Greenland. Most of the rest is deep underground or in the soil, meaning that less than one percent of the fresh water on Earth (approximately 0.007 percent of the Earth’s total water supply) is accessible to humans.
Despite the above information, however, there is still enough to meet current water demands on Earth. It appears that the demand may outgrow supply in the relatively near future. By 2025, 70 percent of the Earth’s total renewable water supply is expected to be in demand. That figure was recently only 30 percent, so we can see that the demand is growing rapidly. So, to sum things up, yes, there is enough water, for now at least.
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