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It’s been all over the news lately, including Forbes.com, that hybrid vehicles are causing a shortage of rare metals. What? Is the era of greener driving over before it’s begun? Let’s take a look.

First, it’s not rare metals that are involved; it’s rare earth elements, which aren’t that rare. These elements, of which there are 15 on the periodic table, aren’t often found by themselves in nature. They’re usually in other elements, and it’s these other elements which are scarce. The rare earth elements are pretty common in trace amounts throughout the earth’s core, according to Popular Science.

Which rare earth elements are we talking about? Here’s a list:

  • Neodymium: part of an alloy used in magnets in electric motors in hybrid cars and wind turbines
  • Terbium and dysprosium: used to keep the neodymium magnetic at high temperatures
  • Lanthanum: used in hybrid car batteries

Most of these metals currently come from China, though California and Canada are looking into mining for them as well. What’s a well-meaning green driver to do? Remember that everything comes from somewhere, and think before you ditch the old for the shiny and new.

So say the geniuses over at Popular Science, anyway, and who am I to disagree? Each year, more than 95% of the 10 million vehicles headed for the parking garage in the sky end up being recycled. Of those cars, 75% of the parts are recycled. Thus, the crown for world’s most recycled product.

Here’s how PopSci breaks it down:

  • 65% of the average vehicle is metal, like steel, iron, or copper, which can be used in construction
  • 90% of all lead-acid batteries are recycled
  • 86% of rubber tires are used to make pavement or fuel paper mills
  • 380 million gallons of oil are refined and reused

David Hazen of Eugene, Oregon, had a dream: to build an electric car in the same manner as you would a hand-crafted wooden boat. And on October 22, 2008, he achieved this dream — mostly. The XP-Humm-E is still missing a few niceties, like doors and carpeting, but it runs and drives, and he’s even got a VIN from the state.

Here’s the 7-minute video of how Hazen constructed the car, which ended up as a Frankenstein of VW, Saab, and Kawasaki parts with glass-backed cedar body panels. It will even have removable gullwing doors; Lamborghini, eat your heart out! The 400 pounds of batteries and 12-hp electric motor propel the XP-Humm-E to a top speed (so far) of 39.5 mph. Normally, according to the video, Hazen can tool around at 35 mph for about 35 miles on a charge.

The video includes an in-car, driver’s-eye-view camera, so you can hear the wind and the road noise, but no engine. For those of you new to the EV experience, that’s a pretty good approximation of what you get. As the car gets more complete, those noises will be lessened, too.

This post is short, but important for anyone who’s got a Prius that they love: Toyota announced last week that it has dropped the price of replacement batteries for its popular hybrid sedan by 10%.

Replacements for the first-generation Prius, built from 2000-2003, can be replaced for $2,229, while second-generation Priuses built from 2004-2008 can get fresh power for $2,588. This, according to Automotive News, will benefit drivers who’ve passed the 10-year/150,000-mile or 8-year/100,000-mile warranty period.

This is good news for folks who like to hang onto a car and drive it into the ground. When the Prius first became available, the longevity of its battery packs was a source of concern. This has turned out to be less of a problem than anyone anticipated, and as time has gone on, prices of nickel metal hydride (NiMH) batteries have come down.

In January, at the North American International Auto Show in Detroit, Mercedes-Benz announced that it would start building its first hybrid vehicle, the ML-450 SUV in June. But a lawsuit filed in Atlanta recently says the battery supplier didn’t hold up its end of the bargain. Production didn’t get off the ground in June, and may never happen, according to M-B.

Battery manufacturer Cobasys is accused of refusing to honor its agreement to supply the electric power source for the hybrid and of misrepresenting its finances to M-B, according to reporting done by the Tuscaloosa News. The German automaker was slated to begin production of the M-Class at a plant in Georgia this summer, but it says there’s no alternative supplier it can use to get the batteries it needs. For its part, Cobasys says it never agreed to produce the battery pack.

If you’re looking for a winner in this post, it may be GM, whose huge Chevy Tahoe Hybrid currently has a cash bonus of up to $6,000 on 2008 models. GM also builds the Saturn Vue Hybrid, a smaller SUV similar in size to the so-popular-its-hard-to-find Ford Escape Hybrid and the M-Class.

Hearing aid battery from PanasonicToyota’s researchers in Japan are working on using zinc air batteries for powering EVs. That’s right — batteries that create electricity out of thin air.

When oxygen from the air around us is introduced into a battery cell, it reacts with a zinc electrode to create electricity. The materials to build these batteries are cheap, and they have high energy density. So why aren’t these things powering your Mini already? Because not even a Mini is small enough to be powered by zinc air batteries. Right now, the most common use for zinc air is in hearing aids.

Despite the small size, Toyota hopes that the move from lead-acid and even lithium-ion batteries to zinc-air will blow open the doors of the EV market, providing the range and speed consumers want from a daily driver. There is a lot of possibility here — it wasn’t that long ago that li-ion batteries were only found in cell phones and laptops, not 100+ mph supercars like the Tesla Roadster.

PHEV PriusPlug-In Supply in Petaluma, California, is selling plug-in conversion kits for the Toyota Prius for the low, low price of $4,995. How can they sell it so cheap? First, that’s the price of the kit only, no shipping or installation included; second, they’re using CalCars Open Source Prius+ Technology as the basis of the conversion.

For you do-it-yourselfers and engineers out there, the kit includes lead-acid batteries and the box to hold them, charger, and wire harness. There’s also a switch you can flip to operate your Prius on battery power up to 52 mph — 10 mph higher than an unmodfied Prius. The converted PHEV can then run 10-15 miles on electricity before the gasoline engine kicks in, giving you 100+ mpg. Plug-In Supply even designed the kit to be upgraded to lithium-iron-phosphate batteries for longer range, when they become available.

There are currently only a handful of dealers where you can buy the kit and lug it home, but Plug-In Supply is looking for more. Those nine dealers already on board stretch from California to Florida and New Jersey, though, so you might be able to find one not too far from home.