This site is pretty silly, claiming that a Prius is more harmful to
the environment than a Hummer.  There argument sums up to:

Zinc for the battery is mined and this one zinc mine was an
environmental disaster dating back more than 50 years.  Response:
Environmental standards have improved a lot in the last 50 years.  The
fact that the mine is in Canada assures me that it is no running in an
environmentally sound manner.

The battery has a limited life and must be disposed of.  Response:
systems are well in place to recycle the materials which will reduce
the need to mine new ore.

The materials for the battery are moved around the world during
manufacturing.  That wastes energy.  Response: Silliest argument of
all.  This is true of any vehicle and most any large or complex
manufactured item.  How does the cost of moving those batteries
compare with the cost of moving the steel for the Hummer from Korea or
Japan or China to the US?  How far did the coke and iron have to
travel to the steel mill?

The Hummer will last 300,000 miles and the Prius will only last
100,000.  Response:  Pure speculation.  If gas goes to $5, I could see
the Hummer getting taken out of service immediately.  Even at $3,
putting $2K into a 100,000 mile, 45 mpg Prius makes good economic
sense if you think it will go at least another 50,000.  Most long-term
Toyota (and Honda) owners will think that is a pretty good bet.

Some conventional subcompacts can get almost 45 mpg.  Response:  Prius
isn't a subcompact and Hummers get about 12.

http://omidr.typepad.com/torque/2007/03/toyotas_prius_i.html

maybe fewer hybrid crap will be forced on our shoulders after
all and Ed Markey would finally shut up?
Did Canada sign Kyoto protocol?