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A local guy posted this on another forum. It all depends upon how you look at it but it shows a perspective of how much surface water there is on earth, compared to the earth itself. Fresh water is less than 3% of the total I understand.
http://apod.nasa.gov/apod/ap120515.html
Its a little misleading.
Yes, if you are going by total volume, then it may be close to a reasonable representation. However, we live on the surface of the planet, 70% of which is water. That is plenty for everything on the planet, and then some.
And yes, freshwater is only 3% of the total, but it is a constant 3%. It never changes, because it is always being recycled as rain, vapor, and other biological stuff (you don't want to know...), and cycled from seawater. Water never gets used up. It just changes from one form to another.
The usable amount of water can change, however. It can be locked up in glaciers, as in the Ice Ages, or moved to other areas, leaving certain areas very dry, as in a desert. But the water is still here, somewhere.
There is no need to worry, unless we pollute it so bad we can no longer use it.
.... unless you are among the significant, and growing, percentage of human beings who do not have access to clean, potable drinking water on a daily basis, or to water to grow subsistence crops.Quote:
Originally Posted by Gigmaster
It's all well and good to say "And yes, freshwater is only 3% of the total, but it is a constant 3%. It never changes, because it is always being recycled as rain, vapor, and other biological stuff (you don't want to know...), and cycled from seawater. Water never gets used up."
But the human population on this planet constantly changes / grows, and will likely continue to grow until there is not enough water to go around, whether "enough" means for human consumption, growing crops, or fly angling.
I'm sure there are folks out there right now working on "solutions". Your grandchildren better hope they are successful.
John
True, but just like hunger, it is a political problem, not a bio, or geological problem. The food and water are here. They are just not being supplied to the people who need it. That is the fault of the government in question. If you will notice, in these countries, the ruling classes seldom look hungry, thirsty or underfed. And their military people look pretty healthy.
Quote:
Originally Posted by JohnScott