Lynne Kiesling
While I'm at Wired, their car blog Autopia is an interesting read, particularly if you are interested in hybrid and/or hydrogen vehicle technologies. The current top post is on an Edmunds estimate that hybrids drivers saved $112 million in fuel costs in 2005. The commenters also raise some good points.
Edmunds also did an analysis a few months ago that showed the hybrids were only economical if the price of gasoline were much higher that it is. For some models the break even point was somewhere around $8/gallon.
I think it is not different from recycling papers. You won't save more than 10 trees spending your whole life recycling papers, while the cost of inconvinience if saved can enable you to plant 10,000 trees probably.
100 million USD is not a large amount of money compared to what productivity growth addes to our economy every year. Personally, I won't be creative at all if I have to write on both sides of the papers, as requested by enviromentalist. If we always think about saving instead of creating, our society won't have future.