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Just as human activity is upsetting Earth's carbon cycle, our actions are altering the water cycle.
The obvious issue is providing clean drinking water and sanitation to every single human being on earth at the cost of little more than one year of the Kyoto treaty.
We put water down into the earth to push up gas, then we say, 'Ooh, we're having a water crisis.' This is foolishness, and this kind of foolishness, where we try to excuse human behavior, is dangerous.
Water covers about 70 percent of the Earth's surface. Of this total, only about 2.5 percent is fresh water, and most of this is frozen in the ice caps of Antarctica and Greenland, in soil moisture, or in deep aquifers not readily accessible for human use.