[Secret Agent Man]

Bigger carbon footprint to build a Prius than a Hummer. And then there are those huge pesky batteries that need replacing every few years.

[ltc8k6]

IIRC, no Prius batteries have been replaced due to age yet.

[Tigercap]

http://www.autotropolis.com/buying-guides/green-cars-guide/emissions-showdown-toyota-prius-vs-hummer-h2.html

[CharlesWayneCT]

Bigger carbon footprint to build a Prius than a Hummer. And then there are those huge pesky batteries that need replacing every few years.

Wrong, and Wrong.

The "analysis" comparing the Prius to a Hummer was totally debunked, and based on such faulty logic as presuming the Prius would be scrapped after 100,000 miles since that was when the warranty expired, while the Hummer was expected to survive almost 3 times as long.

There are virtually no reports of replacing Prius batteries yet:

And Toyota claims that not one has required a battery replacement due to malfunction or "wearing out." The only replacement batteries sold--at the retail price of $3000--have been for cars that were involved in accidents. Toyota further claims that the nickel-metal hydride (NiMH) battery packs used in all Prius models are expected to last the life of the car with very little to no degradation in power capability.

I have two Prius, one's 8 years old, the other 6, and neither has needed a battery replacement, or worn out any other items except the batteries. I haven't even had to replace the brakes yet.

[Colorado Cowgirl]

“Bigger carbon footprint to build a Prius than a Hummer.” I hope you don’t still believe that lie. “huge pesky batteries that need replacing every few years.” Let’s see my Prius has 6 “six-pack size” batteries that weigh 99 pounds total and they should last 8 to 12 years.