How many years will the Earth s water resources be depleted?

As long as freshwater is still circulating, freshwater resources will not be depleted, but if they are polluted, they will decrease until they are depleted.

At present, more than 420 billion cubic meters of sewage are discharged into rivers, lakes and seas around the world every year, polluting trillions of cubic meters of fresh water, which is equivalent to more than 14% of the world's total runoff.

trillion cubic meters 14% 420 billion cubic meters 93 years.

At the current rate, the planet's freshwater resources will be depleted by about 2100.

n years, because it is not known how people will treat water in the future. If people wake up and protect water resources in the future, it will not be depleted because of the water cycle. But if people still waste water, then I think the earth's freshwater resources will be exhausted around 2100.

Hehe, it's not going to be dead, I'm talking about freshwater resources, and by 2100 I think humans will use their so-called in order to survive"Desalination"bar. Because when we talk about water resources first, we basically mean the freshwater resources available on land.

Upstairs, what about the evidence?

There is the protection of the atmosphere, and the moisture will not escape the earth. It's always in cycles: evaporation, rain, ......Aren't there a lot of sewage treatment plants out there to solve these problems?

I also saw a desalination institute that day!

It is believed that humanity will solve this problem before the freshwater resources are depleted.

50 years (if there are no live products).

After improving the utilization rate, saving and rational utilization, controlling water pollution, and preventing and controlling water pollution, water is a renewable resource that can be used sustainably. However, it requires the full cooperation of society, otherwise it cannot be calculated.

With the exception of water molecules that escape from the atmosphere into space (in negligible quantities), the total amount of water on Earth can be said to be essentially constant. From this point of view, the earth's fresh water will not be exhausted. However, if uncontrolled development and use, freshwater resources are likely to be depleted.

There is a lot of water on the planet, but there is very little water that we humans can use directly. The water on the earth is saltwater, including seawater, saltwater lake water, and highly mineralized groundwater, which has a high salt content and is difficult to use directly. The Earth's fresh water is about 100 million cubic kilometers, accounting for the total amount of water.

Much of this freshwater is found in solid forms of snow and ice in the North and South poles, mountain glaciers, continental ice sheets, and permafrost. With our current technical conditions, it is also difficult to develop and utilize this fresh water. In addition, deep groundwater is difficult to extract, and the earth's fresh water cannot be used by humans.

Only 7/100,000 of the earth's water is the freshwater that we can really exploit, and it is rivers, lakes and shallow groundwater. Isn't it dangerous to have so little "usable water"? Will the planet run out of fresh water one day?

The question cannot be a simple "yes" or "no". With the exception of water molecules that escape from the atmosphere into space (in negligible quantities), the total amount of water on Earth can be said to be essentially constant.

The earth's water is circulating. In general, water on the earth is converted into water vapor (water vapor) into the air through evaporation from the ground and water surface and transpiration by plants. Air is moving, and water vapor travels to other areas with the air current, and if it encounters suitable natural conditions, water vapor may condense and fall back to the ground in the form of rain and snow. In this way, water is constantly circulating on the earth, and the total amount does not increase or decrease.

Globally, the total amount of water evaporation and precipitation does not change much from year to year, and although some freshwater lakes have become saltwater lakes due to the decrease in water volume, the total amount of freshwater on the earth remains basically constant.

From this point of view, the earth's fresh water will not be exhausted. However, if uncontrolled development and use, freshwater resources are likely to be depleted. Whether it is production or life, what we need is clean fresh water, and dirty and smelly water cannot be used for agricultural irrigation, breeding and daily use.

The earth's freshwater will not be depleted, because the world's water resources are renewable through the water cycle.

But if human water consumption is greater than the difference between precipitation and evaporation, local water resources will be depleted.

At present, the earth still has abundant water resources, but there are still problems such as water shortage, water pollution and spring dyeing. According to a 2006 report by the United Nations Environment Programme in South Africa, only one of the world's total amounts of freshwater is available globally, and most of it is stored in snow and ice in the Antarctica and Greenland ice sheets, which are not fully utilized and very costly.

Nearly 40% of the world's population lives in areas where water or access to water is scarce, and water scarcity is likely to be exacerbated in some areas due to climate change and other factors. Water pollution is also one of the serious problems we are currently facing, and it is difficult for traditional water treatment methods to effectively deal with complex pollutants, so it is necessary to find new technical means and management methods to ensure people's drinking water safety and environmental health.

If you're talking about freshwater resources, there's very little clean water available, about about the world's water reserves.

The earth's water storage is abundant, with a total of 100 million cubic kilometers.

Although the amount of water on the earth is huge, there is very little water that can be directly used by people in production and life. Most of it is Hu Oak seawater, which is salty and bitter, undrinkable, unwaterable, and difficult to use for industry. The Earth's freshwater resources account for only a fraction of its total water, and of these few freshwater resources, more than 70% are frozen in the Antarctic and Arctic ice caps, and together with the inaccessible mountain glaciers and permafrost snow, 87% of the degraded and rapid water resources are difficult to use.

The freshwater resources that humans can really use are some of the rivers, lakes and groundwater, which account for about the total amount of water on the planet.

Categories: Education, Science, >> Science & Technology.

Analysis: There is a lot of water on Earth, and it is estimated that the total volume of water is about 13.8 billion cubic kilometers. If this water is evenly distributed on the earth's surface, it is equivalent to the earth's answer, and the entire surface is covered with a layer of water with an average depth of 2,650 meters.

Unfortunately, this water98 is saltwater, mainly found in the ocean. Fresh water only accounts for 2 of the total water of the earth, about 30 million cubic kilometers, and the fresh water of these 2 can not be all used by human beings, because its 88 is frozen in the ice caps and glaciers at the poles, and the remaining 12 that is, rivers, lakes and shallow groundwater that can be exploited can be used by human beings, and the vast majority of them are groundwater, which can not be applied without exploitation, and the water in rivers and lakes that can be directly applied only accounts for 0 04 of the total amount of fresh water. Water on Earth is always in flux, with water from the oceans and lands evaporating into the atmosphere, and then falling back to the earth as rain or snow, nourishing all things, replenishing rivers, lakes or flowing into the sea.

Water can also seep into the ground and sink into underground aquifers. Extremely deep groundwater cannot be replenished or extracted, and is known as primary water and therefore cannot be regenerated. As a result of this fluid nature of water resources, land-based floods or droughts have resulted in an uneven distribution of water resources, with about 65 of the world's water resources concentrated in 10 countries each year, while 80 countries with a combined population of 40 (9 of which are in the Near and Middle East) are experiencing severe water scarcity, and 26 countries (with a total population of 230 million people) have very little water resources.

We call these countries water-scarce countries. The international standard for water-scarce countries is based on the definition given by the Swedish writers Marin and Falkenmark: if a country has less than 1,700 tons of renewable freshwater** per person per year, then the country will be in a state of water shortage on a regular or frequent basis; If the amount of water per person per year is less than 1,000 tons, then there will be a shortage of water.

At present, there are 15 countries with an average annual water of less than 1,000 cubic meters per person. With only 82 cubic metres per capita per year, Malta has the highest water scarcity among these countries. In addition to Malta, the most water-scarce countries are Qatar (91 cubic metres per capita per year), Kuwait (95 cubic metres), Libya (111 cubic metres), Bahrain (162 cubic metres), Singapore (180 cubic metres), Barbados (192 cubic metres), Saudi Arabia** 249 cubic metres), Jordan (318 cubic metres), Yemen (346 cubic metres), Algeria (527 cubic metres), Burundi (594 cubic metres), Cape Verde (777 cubic metres), Oman (874 cubic meters), United Arab Emirates (902 cubic meters), Egypt (936 cubic meters).

Water is expected to be more expensive than oil in these countries by the middle of the 21st century, with Malta as per capita at 68 cubic metres per year.