Beyond the BookDid you know?
- The earth contains about 1.1 quadrillion acre-feet of water, but 97% is seawater.
- Of the remaining 28 trillion acre-feet of freshwater on or near the surface, two-thirds is locked up as ice.
- Only the remaining 9.7 trillion acre-feet is in liquid form, mostly in underground aquifers.
- However, what is more meaningful for scientists is how fast a particular source can be replenished by rain. For example, many of the world's biggest aquifers are under deserts in North Africa and the Middle-East (the legacy of eons past), but they are not getting replenished.
- It's estimated that it takes 1/2 an Olympic sized swimming pool in water to feed, water and clothe an average...