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from Ars Technica
Not just oil: US hit peak water in 1970 and nobody noticed
The concept of peak oil, where the inaccessibility of remaining deposits ensures that extraction rates start an irreversible decline, has been the subject of regular debate for decades. Although that argument still hasn't been settled—estimates range from the peak already having passed us to its arrival being 30 years in the future—having a better sense of when we're likely to hit it could prove invaluable when it comes to planning our energy economy. The general concept of peaking has also been valuable, as it applies to just about any finite resource. A new analysis suggests that it may be valuable to consider applying it to a renewable resource as well: the planet's water supply. The analysis, performed by staff at the Pacific Institute, recognizes that there are some significant differences between petroleum and water. For oil, using it involves a chemical transformation that won't be reversed except on geological time scales. Using water often leaves it in its native state, with a cycle that returns it to the environment in a geologic blink of an eye. Still, the authors make a compelling argument that, not only can there be a peak water, but the US passed this point around 1970, apparently without anyone noticing.
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from The Spokesman-Review
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