This post is from Allen Schaeffer, Executive Director of the Diesel Technology Forum in response to our Diesel Mania post. You can visit their website at http://www.dieselforum.org/

In Detroit, January usually means gray skies. But this January the predominant color is green, since the 2008 North American International Auto Show was seeking to answer the big question "Which shades of green auto technology are going to be 'in style' for the future?"

We saw that clean diesel is near the front of the pack. This year, twelve auto manufacturers will make at least Thirteen firm diesel model introductions and announcements, along with unveiling four future diesel concepts, in half a dozen market segments.

Nearly twenty diesel vehicles were on display at the Detroit auto show - not too shabby for a 100-year-old technology. It's easy to see why diesel embodies the true meaning of the color green: cleaning up the emissions has brought diesel into harmony with the environment.

Harmony means an effective balance of competing attributes: fuel efficiency, low emissions, performance, outstanding driving experience, and value for investment. By eliminating all the things consumers never liked about diesel (slow, smelly and smoky) and replacing those with things they will like (fast, clean and fun), diesel is a fresh alternative for the future. Diesel is also green because it saves greenbacks in the long run - it pays you back over time in higher resale values, less fuel consumption and greater performance.

The buzz about green technologies is big, and so are the stakes. Some technologies were quickly embraced as green. Other technologies are going to have to earn it the hard way - by proving themselves at every step of the way in the face of unrelenting scrutiny. We're betting that this fresh new choice - clean diesel - can earn its share of success through good old-fashioned hard work. Bring it on.