By Max Lindberg •
April 29, 2008
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It had to happen, just when we were beginning to think that plug-in hybrid and electric cars were the best things since sliced bread, someone has intimated that there may be a health risk involved in driving those vehicles.
You remember, the power line scare back in the ’70’s (which really hasn’t gone away) and of course the more recent flap about cell phones emitting dangerous electromagnetic fields to the brain. In case you want to read more on these issues, a specific Google entry should suffice.Now, before you go somewhere else, hang on, there’s more to this electromagnetic field issue than you may think. That’s coming up, along with a short tip of the hat to the man who got us started on our way to the world we live in.
While plug-in hybrids offer great increases in fuel efficiency, they may come at a surprising cost: water. A recent study from Environmental Science & Technology found that plug-ins require the consumption of 3 times more water, and the withdrawal of 17 times more water, than their gasoline counterparts. As Popular Mechanics pointed out last week:
A 30-mile commute in a gasoline-powered car would require the withdrawal of 18.9 gallons of water… The same commute in a plug-in hybrid electric vehicle (PHEV), meanwhile, would take a whopping 318 gallons…
So what accounts for the increase in water usage? PHEV’s don’t require water directly, but the power plants that power them do:
Any power plant that runs steam turbines uses water, whether fired by coal, natural gas, or nuclear energy, says King, a mechanical engineer at the Bureau of Economic Geology at UT. Many plants consume water by running it through cooling towers where it evaporates away. Plants can also tie up water resources via withdrawal, in which plants recycle water that is drawn from a reservoir.
